Tarsnap

Tarsnap
Original author(s)	Colin Percival
Developer(s)	Colin Percival
Initial release	25 April 2008; 16 years ago
Stable release	1.0.40 / 10 February 2022; 2 years ago
Repository	github.com/Tarsnap/tarsnap ;
Written in	C
Operating system	Unix-like
Platform	Cross-platform
Size	615.7 kB
Type	Online backup service
License	Proprietary
Website	www.tarsnap.com
As of	January 2016

Tarsnap is a secure online backup service for UNIX-like operating systems, including BSD, Linux, and OS X. It was created in 2008 by Colin Percival. Tarsnap encrypts data, and then stores it on Amazon S3.

Quick Facts Original author(s), Developer(s) ...

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The service is designed for efficiency, only uploading and storing data that has directly changed since the last backup.^[4] Its security keys are known only to the user.^[5]

It was developed and debugged, with input solicited from bug bounty hunters, to try to find vulnerabilities.^[6] A serious nonce-reuse vulnerability was found by this process and fixed in 2011.^[7]

The document of the presentation "From bsdtar to tarsnap"^[8] by Percival from EuroBSD-Con 2013 contains "all kinds of detail on exactly how the algorithms work, how deduplication is managed ... the innards of how Tarsnap works"^[9]

Comparison of online backup services

[1]
"Old Tarsnap releases". Tarsnap. 20 August 2015. Retrieved 4 January 2016.
[2]
"Release 1.0.40 · Tarsnap/tarsnap". GitHub. Archived from the original on 13 Feb 2022. Retrieved 13 Feb 2022.
[3]
Percival, Colin. "Tarsnap Download Page". Tarsnap. Retrieved 23 November 2017.
[4]
Fabbro, Andrew (August 2012). "Tarsnap: Online Backups for the Truly Paranoid". Linux Journal: 104–113. Retrieved August 21, 2012.
[5]
Dragani, Rachelle (May 17, 2012). "Dropbox Security System Doesn't Lock Down Files, Says FTC Complaint". E-Commerce Times/Technewsworld.com. Retrieved August 21, 2012.
[6]
Pauli, Darren (May 18, 2012). "AusCERT2012: FreeBSD talks amateur bug hunting". SC Magazine. Australia. Retrieved August 21, 2012.
[7]
Edge, Jake (January 19, 2011). "Tarsnap advisory provides a few lessons". LWN.net. Retrieved August 21, 2012.
[8]
Percival, Colin. "From bsdtar to tarsnap - Building an online backup service" (PDF). www.tarsnap.com. Tarsnap Backup Inc. Retrieved 6 November 2015.
[9]
Lucas, Michael W (2015). Tarsnap Mastery - Online Backup for the Truly Paranoid (1st ed.). Grosse Pointe Woods, Michigan: Tilted Windmill Pressd. p. 32. ISBN 978-0692400203.

[1] [1]
"Old Tarsnap releases". Tarsnap. 20 August 2015. Retrieved 4 January 2016.

[2] [2]
"Release 1.0.40 · Tarsnap/tarsnap". GitHub. Archived from the original on 13 Feb 2022. Retrieved 13 Feb 2022.

[3] [3]
Percival, Colin. "Tarsnap Download Page". Tarsnap. Retrieved 23 November 2017.

[LJAu12-4] [4]
Fabbro, Andrew (August 2012). "Tarsnap: Online Backups for the Truly Paranoid". Linux Journal: 104–113. Retrieved August 21, 2012.

[TN-5] [5]
Dragani, Rachelle (May 17, 2012). "Dropbox Security System Doesn't Lock Down Files, Says FTC Complaint". E-Commerce Times/Technewsworld.com. Retrieved August 21, 2012.

[AusCert-6] [6]
Pauli, Darren (May 18, 2012). "AusCERT2012: FreeBSD talks amateur bug hunting". SC Magazine. Australia. Retrieved August 21, 2012.

[LWN11-7] [7]
Edge, Jake (January 19, 2011). "Tarsnap advisory provides a few lessons". LWN.net. Retrieved August 21, 2012.

[CP-BSDCon13-8] [8]
Percival, Colin. "From bsdtar to tarsnap - Building an online backup service" (PDF). www.tarsnap.com. Tarsnap Backup Inc. Retrieved 6 November 2015.

[LucasMW-TarsnapMastery-p32-9] [9]
Lucas, Michael W (2015). Tarsnap Mastery - Online Backup for the Truly Paranoid (1st ed.). Grosse Pointe Woods, Michigan: Tilted Windmill Pressd. p. 32. ISBN 978-0692400203.

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Tarsnap

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