⚡Stack Radar

Backup & Recovery · Reviewed 21 Oct 2026

Tarsnap

Encrypted, deduplicated command-line backup service for UNIX-like systems.

free tier · tarsnap.com ↗

Paid against free › Backup & Recovery › Tarsnap

Tarsnap at a glance
3.2KEstimated total trafficModeled monthly visits13Ranking keywordsPublic search sample90/100Technical health15 pages checked3.1KReferring domainsLive backlink summary

Overview

01

Summary

The useful answer before the supporting detail.

Tarsnap is a command-line online backup service for UNIX-like systems, offering client-side encryption and block-level deduplication S1. It is used by individuals and organizations needing secure, efficient backups, such as Pebble and Stripe S36. Its practical value lies in pay-per-use pricing with no fixed costs, ensuring users only pay for what they store and transfer S1.

02

Product identity and positioning

Name, category, positioning, audience, and first-party claims.

  • Identity: Tarsnap is a command-line online backup service for UNIX-like systems S1.
  • Core purpose: Provides secure, efficient backups with client-side encryption and deduplication S1.
  • Intended users: Users of Linux, BSD, macOS, and other UNIX-like systems S1.
  • Product scope: A single command-line tool, closely related to tar, with a similar interface S45.
  • Positioning: Positioned as "online backups for the truly paranoid" S1.
  • Claimed distinction: Emphasizes that users need not trust the service, as encryption can be verified independently S1.
03

Use cases and audiences

Who the product serves and the jobs it is designed to handle.

AudiencePractical use case
System administratorsAutomate backups of internal infrastructure S36.
Security-conscious usersEnsure data is encrypted and inaccessible without personal keys S1.
UNIX-like system usersUse a tar-like command-line interface for flexible backup creation S45.

Features

09

Features and capabilities

Core functions and evidence-backed product capabilities.

CapabilityWhat it does
Client-side encryptionEncrypts data locally so only the user's keys can access it S1.
Block-level deduplicationUploads only unique data blocks, reducing storage and bandwidth S1.
Command-line interfaceOffers a tar-like interface for creating and managing archives S45.
Key managementGenerates and manages key files, including restricted keys for limited operations S41.
Extraction resumeCan resume interrupted extractions S30.
Passphrase from environmentReads passphrase from environment variable or file S30.
Third-party helper scriptsCommunity scripts automate backups and integration with development tools S35.
10

Integrations and ecosystem

Connected products, exports, APIs, and workflow compatibility.

Integration or interfaceTypeWhat it enables
Third-party helper scriptsIntegrationAutomate backups, rotation, and integration with development tools S35.
Package repositories (SuSE, XBPS, Fedora Copr)IntegrationInstall Tarsnap via system package managers S42.
Windows Subsystem for LinuxPlatformRun Tarsnap on Windows via WSL S1.
libarchiveLibraryUnderlying open-source archive handling library S111.

Pricing

11

Pricing and plans

Published plans, free access, trials, credits, and pricing limitations.

Plan or offerVerified price and billingIncludedLimits
Usage-based$0.25 per GB-month storage; $0.25 per GB bandwidth S1Prepaid, per byte after deduplication, compression, and encryption S1No fixed costs or minimum monthly fees S1

Competition

12

Competitive landscape

Domains competing for the same organic search demand.

Sampled competitors

CompetitorFirst-page appearancesSampled queriesAverage positionQueries observed
reddit.com226tarsnap, scrypt
youtube.com111scrypt
en.wikipedia.org112tarsnap
gchq.github.io112scrypt
news.ycombinator.com113tarsnap
algorithmhalloffame.org113scrypt
github.com114tarsnap
millionminer.com114scrypt
kalzumeus.com115tarsnap
modules.vlang.io115scrypt

Website intelligence — Collected evidence

Customers, testimonials, and first-party review claims

Page typeEvidenceSource
customers0https://www.tarsnap.com/testimonials.html
customers[Navigation menu](#nav)https://www.tarsnap.com/testimonials.html
customersTestimonialshttps://www.tarsnap.com/testimonials.html
customersStripe has been a happy Tarsnap customer for several years. It's robust and thoughtfully designed, Colin has provided great support, and "backups for the truly paranoid" is a pitch that very much resonates with us.https://www.tarsnap.com/testimonials.html
customersPatrick Collison, Stripe co-founderhttps://www.tarsnap.com/testimonials.html
customersTarsnap is the most cleanly designed and convenient of the many UNIX backup schemes I've tried.https://www.tarsnap.com/testimonials.html
customersRobert Morris, Professor, MIT CSAILhttps://www.tarsnap.com/testimonials.html
customersTarsnap is the world's best secure online backup service... I use it extensively in my company, recommend it to clients doing Serious Business (TM) all the time, and love seeing it successful.https://www.tarsnap.com/testimonials.html
customersPatrick McKenzie (patio11), CEO, Starfighterhttps://www.tarsnap.com/testimonials.html
customersTarsnap takes security and availability seriously, and it shows. It’s the only remote backup service I recommend.https://www.tarsnap.com/testimonials.html
customersNate Lawson, Founder, SourceDNAhttps://www.tarsnap.com/testimonials.html
customersTarsnap, the secure online backup service for Unix-like systems, raised the bar for online backups. It's inexpensive. It's reliable. And you don't need to trust the Tarsnap service — they can't access your backups even if they wanted to.https://www.tarsnap.com/testimonials.html
customersMichael W. Lucas, author of Tarsnap Masteryhttps://www.tarsnap.com/testimonials.html
customersTarsnap is the only cryptographically secure backup solution I've ever recommended. It's what I trust my own data with.https://www.tarsnap.com/testimonials.html
customersThomas Ptacek, Principal, Starfighterhttps://www.tarsnap.com/testimonials.html
customersWe use tarsnap to back-up much of Pebble's internal infrastructure. The simple command line client, rock solid security and reliability, and incremental backup feature make it a breeze to set-up a daily backup on a cron job and forget about it.https://www.tarsnap.com/testimonials.html
customersFrançois Baldassari, Software @ Pebblehttps://www.tarsnap.com/testimonials.html

Independent review sources discovered

No links to supported independent review platforms were discovered on the collected pages.

14

AI visibility

Measured ChatGPT and Google AI mentions with cited sources.

AI-assistant referral traffic

  • Estimated current generative-AI referral share: 1.7%

Scout traffic model did not return a separate AI-referral trend series for this domain.

Website intelligence — Collected evidence

Site-stated AI capabilities

No supporting public-page evidence was collected for this category.

These are first-party product claims, not independent measurements of AI-search visibility.

15

Marketing opportunities

Actions calculated directly from the collected evidence.

OpportunityRecommended actionEvidence
Striking-distance keywordMove “scrypt” from position 4 toward the top three.Volume 480 · https://www.tarsnap.com/scrypt.html
Important pageStrengthen the page already earning search visibility before creating an unrelated page.https://www.tarsnap.com/scrypt.html · 3 sampled keywords · best position 4
Competitor gapReview the sampled queries where reddit.com appears.2 first-page appearances across tarsnap, scrypt

Website intelligence — Collected evidence

Website evidence gaps

  • pricing: no usable public page was collected; verify whether the site publishes this evidence.
  • features: no usable public page was collected; verify whether the site publishes this evidence.
  • reviews: no usable public page was collected; verify whether the site publishes this evidence.

Trust and proof

16

Customers, proof, and reviews

Published proof, customer signals, and review evidence.

Independent reviews

PlatformPageHow it was foundNote
Linux JournalTarsnap: On-line Backups for the Truly Paranoid / Linux JournalGrounded web searchblocks of data. This means that if you change one file in a directory, only ... previously existed. If you move files around, Tarsnap is smart enough to recognize and skip previously ... , which creates a new archive. Behind the scenes, Tarsnap

Customer proof

Proof typeNamed customer or sourceEvidence
Customer evidenceWeWe use tarsnap to back-up much of Pebble's internal infrastructure. (source)

Independent mentions

  • I can't recommend Tarsnap (https://www.tarsnap.com/) enough for personal backups... / Hacker News — I can't recommend Tarsnap (https://www.tarsnap.com/) enough for personal backups for hacker-types. Everything is encrypted client-side, so don't lose you key or thee is literally nothing you can do to get at your data again. It's also deduplicated and compressed so you can do snapshots often (on my machines I have a cron that runs every six hours) without going broke since (similar to git) you're only storing changes. ... I LOVE Tarsnap and use it for offsite backups for my most critical informa
  • Tarsnap – Online backups for the truly paranoid / Hacker News — Colin is probably one of the best minds in encryption that I know of. He wrote Scrypt 1 as well. My gripe has always been that while Tarsnap is a product that is clearly built ... This is certainly one way to do backups. Two things which come to mind on first reading: 1. You're encrypting backups but not authenticating them; someone with access to your archives could trivially truncate an archive or replace one archive with another, and there's a nontrivial chance that they could splice parts o
  • Tarsnap - Encrypted, deduplicated command-line backup for Linux, BSD, and macOS — Tarsnap - Encrypted, deduplicated command-line backup for Linux, BSD, and macOS ... Tarsnap is a secure and efficient command-line online backup service for Linux, FreeBSD, NetBSD, OpenBSD, macOS, and other UNIX-like operating systems: ... - Encryption: your data can only be accessed with your personal keys. We can't access your data even if we wanted to! - Source code: the client code is available. You don't need to trust us; you can check the encryption yourself! - Deduplication: only the uniq
  • Tarsnap - tarsnap(1) — ``` tarsnap creates, reads, deletes, and otherwise manages online backups. ... The first option to tarsnap is a mode indicator from the following list: -c Create an archive containing the specified items and
  • Tarsnap - Deduplication explanation — ### How does deduplication work? Tarsnap deduplicates your data by: 1. Splitting it into chunks ("chunkification"). 2. Only uploading chunks that haven't been uploaded before. Each archive is expressed as a list of chunks, which grants us a great deal of flexibility and efficiency.
  • Tarsnap - Frequently Asked Questions — Note that deduplication is most effective when creating multiple snapshots (e.g., daily backups), so it will not help much for the initial snapshot. We have a few examples of deduplication with multiple snapshots.
  • Tarsnap - Online backups for the truly paranoid / Hacker News — Colin. I would love to see it move off onto a less personally annoying ... the tarsnap client running on your box encrypts the data before it's ever transmitted, that's part of what makes tarsnap cool (along with the deduplication)
  • Tarsnap - https://www.tarsnap.com/ Online backups for the truly paranoid best pa... / Hacker News — Tarsnap - https://www.tarsnap.com/ Online backups for the truly paranoid best part is the deduplication efficiency - https://www.tarsnap.com/deduplication.html ... That’s not really a Dropbox alternative as it’s not made for sharing.

External links were grounded in one live web search. Search snippets are leads, not independently scraped page content; rejected links remain available in Review evidence.

17

Company, security, and trust

Ownership, policies, security signals, and public trust evidence.

SignalFindingSource
Company and ownershipTarsnap Backup Inc. is the entity behind the service S33.S33
Contact and supportMailing lists exist for announcements, users, and pre-release testing S30.S30
Legal and privacyTerms and conditions mention sharing information to keep the service running or diagnose problems S130.S130
Security and complianceData can only be accessed with personal keys; users can verify encryption themselves S1.S1
Uptime and status pageInfrastructure page includes uptime data S32.S32
18

Documentation and product updates

Help resources, product guidance, and visible changes over time.

Resource or updateTypeWhat is availableDate or freshness
Tarsnap - DocumentationDocumentationDocumentation for Tarsnap (source)Not dated
Tarsnap - NewsRelease notesPublic product change history. (source)Not dated
Tarsnap - NewsProduct updateProduct update is publicly available. (source)July 29, 2017
Tarsnap - NewsSupportPublic contact and support channel. (source)Not dated

Not found in the collected public sources: public roadmap, status page, separate help center or knowledge base.

Technical

19

Technical and delivery signals

Delivery model, platforms, API, data ownership, reliability claims and release activity.

SignalFindingSource
Delivery model (cloud, self-hosted, desktop, browser extension)Cloud service built on Amazon Web Services S32.S32
Platforms and appsSupports Linux, FreeBSD, NetBSD, OpenBSD, macOS, and other UNIX-like systems; also Cygwin and WSL S1.S1
API and extensibility (API, SDK, webhooks, MCP, plugins)No public API documented; third-party helper scripts exist S35.S35
Data ownership and exportUsers can delete archives independently; data is encrypted and only accessible with keys S1 S54.S1 S54
Performance and reliability claimsImproved performance on x86, amd64, arm64 via cryptographic instruction set extensions S30.S30
Release activityMultiple releases documented, e.g., 1.0.41, 1.0.40 S42 S30.S42 S30
20

Measured infrastructure

Domain, certificate, and hosting signals, measured directly.

SignalFinding
Domain registered2007-06-21 — Porkbun LLC
Domain expires2027-06-21
TLS certificateLet's Encrypt, valid, expires 2026-12-12
Security headersnone served
Headers not servedHSTS, CSP, X-Content-Type-Options, X-Frame-Options, Referrer-Policy
Server headerApache/2.4.66 (FreeBSD)
Mail handled bymail.tarsnap.com
Nameserversns-1851.awsdns-39.co.uk, ns-64.awsdns-08.com

Not measurable: wayback: rate limited by archive.org, ladder stopped after 1 probe(s). A gap here means the lookup was unavailable, not that the finding is negative.

21

Technical site audit

A bounded multi-page crawl with page-level issues and URLs.

Scout — Bounded technical crawl

  • Pages crawled: 15 of 15 maximum
  • Technical health: 90/100
  • Critical issues: 0
  • Warnings: 26
  • Notices: 11

Issues

SeverityIssueValueAffected URL
warningTitle length should be reviewed79https://www.tarsnap.com/
noticeMeta description length should be reviewed178https://www.tarsnap.com/
warningPage should have one primary H10https://www.tarsnap.com/
warningTitle length should be reviewed79https://www.tarsnap.com/
noticeMeta description length should be reviewed178https://www.tarsnap.com/
warningPage should have one primary H10https://www.tarsnap.com/
warningPage should have one primary H10https://www.tarsnap.com/gettingstarted.html
noticeMeta description length should be reviewed25https://www.tarsnap.com/flexibility.html
warningPage should have one primary H10https://www.tarsnap.com/flexibility.html
noticeMeta description length should be reviewed27https://www.tarsnap.com/efficiency.html
warningPage should have one primary H10https://www.tarsnap.com/efficiency.html
warningPage should have one primary H10https://www.tarsnap.com/utility.html
warningPage should have one primary H10https://www.tarsnap.com/security.html
noticeMeta description length should be reviewed32https://www.tarsnap.com/download.html
warningPage should have one primary H10https://www.tarsnap.com/download.html
warningTitle length should be reviewed79https://www.tarsnap.com/index.html
noticeMeta description length should be reviewed178https://www.tarsnap.com/index.html
warningPage should have one primary H10https://www.tarsnap.com/index.html
noticeMeta description length should be reviewed44https://www.tarsnap.com/news.html
warningPage should have one primary H10https://www.tarsnap.com/news.html
noticeMeta description length should be reviewed36https://www.tarsnap.com/about.html
warningPage should have one primary H10https://www.tarsnap.com/about.html
noticeMeta description length should be reviewed36https://www.tarsnap.com/testimonials.html
warningPage should have one primary H10https://www.tarsnap.com/testimonials.html
noticeMeta description length should be reviewed14https://www.tarsnap.com/legal.html
warningPage should have one primary H10https://www.tarsnap.com/legal.html
warningPage should have one primary H10https://www.tarsnap.com/infrastructure.html
noticeMeta description length should be reviewed25https://www.tarsnap.com/bugbounty.html
warningPage should have one primary H10https://www.tarsnap.com/bugbounty.html
warningDuplicate title in audit sample3https://www.tarsnap.com/
warningDuplicate title in audit sample3https://www.tarsnap.com/
warningDuplicate title in audit sample3https://www.tarsnap.com/index.html
warningDuplicate meta description in audit sample3https://www.tarsnap.com/
warningDuplicate meta description in audit sample3https://www.tarsnap.com/
warningDuplicate meta description in audit sample3https://www.tarsnap.com/index.html
warningDuplicate meta description in audit sample2https://www.tarsnap.com/flexibility.html
warningDuplicate meta description in audit sample2https://www.tarsnap.com/bugbounty.html

Crawled pages

StatusTitleH1sWordsResponseURL
200Tarsnap - Encrypted, deduplicated command-line backup for Linux, BSD, and macOS0780225 mshttps://www.tarsnap.com/
200Tarsnap - Encrypted, deduplicated command-line backup for Linux, BSD, and macOS078071 mshttps://www.tarsnap.com/
200Tarsnap - Getting started0762220 mshttps://www.tarsnap.com/gettingstarted.html
200Tarsnap - Flexibility0350217 mshttps://www.tarsnap.com/flexibility.html
200Tarsnap - Efficiency0259215 mshttps://www.tarsnap.com/efficiency.html
200Tarsnap - Utility035875 mshttps://www.tarsnap.com/utility.html
200Tarsnap - Security048476 mshttps://www.tarsnap.com/security.html
200Tarsnap - Download0139479 mshttps://www.tarsnap.com/download.html
200Tarsnap - Encrypted, deduplicated command-line backup for Linux, BSD, and macOS078077 mshttps://www.tarsnap.com/index.html
200Tarsnap - News0133573 mshttps://www.tarsnap.com/news.html
200Tarsnap - About030974 mshttps://www.tarsnap.com/about.html
200Tarsnap - Testimonials025376 mshttps://www.tarsnap.com/testimonials.html
200Tarsnap - Terms and Conditions066479 mshttps://www.tarsnap.com/legal.html
200Tarsnap - Infrastructure042673 mshttps://www.tarsnap.com/infrastructure.html
200Tarsnap - Bug Bounty077073 mshttps://www.tarsnap.com/bugbounty.html

This is a bounded Scout crawl. Core Web Vitals and Lighthouse scores are not claimed unless a dedicated performance audit is connected.

22

Search Console and Analytics

First-party search and behavioral data connection state.

Modeled acquisition channels

ChannelEstimated share
direct39.2%
search33.0%
search organic31.5%
search paid1.5%
social6.2%
social organic5.5%
social paid0.7%
referrals10.2%
paid referrals3.5%
mail3.5%
gen ai1.7%
affiliate2.7%
other0.0%

First-party connections

IntegrationStatusData available after connection
Google Search ConsoleNot connectedClicks, impressions, CTR, average position, queries, pages, countries, and devices
Google AnalyticsNot connectedOrganic sessions, engagement, landing pages, conversions, geography, and devices

No first-party Search Console or Analytics numbers are shown until the site owner authorizes the corresponding Google account. Scout traffic model values above are modeled estimates, not private analytics totals.

Limits and method

23

Limitations and open questions

Known constraints and missing evidence from the collected pages.

The collected pages do not mention any competitor products. Evidence gaps include lack of detailed pricing for annual billing, no explicit API documentation, and no independent review ratings collected. Open questions remain about the exact scope of third-party integrations and the current status of the bug bounty program.

24

Sources, method, and limitations

Evidence inventory, collection method, provider use, and constraints.

This report is based on 15 collected pages from tarsnap.com, including the homepage, documentation, pricing, security, and testimonials pages. The evidence catalog includes 140 entries, with sources ranging from official pages to external proof search. Limitations: external proof search results were not scraped for content, and some pages may be outdated. The report relies on first-party evidence only.

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