https://rdiff-backup.net/ [ 1 ] was http://www.nongnu.org/rdiff-backup/
Combines rsync with diff storage, so one can retrieve a backup from any point in time.
My initial impression was “Works wonderfully well.. very easy to use, very nice. Would be nice to have a GUI tool for recovery purposes though, but oh well.” .. but my 2009-04-01 glance was a flop.
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