remove tarsnap: no FLOSS server

README.md

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 * [Rsnapshot](http://www.rsnapshot.org/) - Filesystem Snapshotting Utility.
 * [SafeKeep](http://safekeep.sourceforge.net/) - Centralized pull-based backup using `rdiff-backup`.
 * [Snebu](http://www.snebu.com/) – Snapshot backup with global multi-client deduplication and transparent compression.
-* [TarSnap](https://www.tarsnap.com/) - Secure backup service with an open-source client.
 * [UrBackup](http://www.urbackup.org/) - Another client-server backup system.
 * [DREBS](https://github.com/dojo4/drebs) - AWS EBS backup script that supports strategies.
 * [ZBackup](http://zbackup.org/) - A versatile deduplicating backup tool.