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Rsync-backup automates the process of backing up machines with rsync and ssh.
- Only changed data shipped
- All permissions preserved
- All communication encrypted
- Unlimited snapshots
- Use <= 2X-4X combined client capacity
Rsync and ssh provide the first three features. By using a Unix feature called hardlinks, 10 daily snapshots of a 5 megabyte file that hasn't changed take only 5 megabytes of space on the backup server. If that file is used on 10 machines (because, perhaps, it comes with the distribution used on all 10), those 50 5 megabyte files take up only 5 megabytes on the server! As the documentation mentions, the freedups package from http://www.stearns.org/freedups/ is required to get this benefit.