8.4.2 Daily backup with pdumpfs

pdumpfs is a simple daily backup system similar to Plan9's dumpfs which preserves every daily snapshot. You can access the past snapshots at any time for retrieving a certain day's file. Let's backup your home directory with pdumpfs and cron!

pdumpfs constructs the snapshot YYYY/MM/DD in the destination directory. All source files are copied to the snapshot directory when pdumpfs is run for the first time. On and after the second time, pdumpfs copies only updated or newly created files and stores unchanged files as hard links to the files of the previous day's snapshot in order to save disk space.

     $ pdumpfs src-dir dest-dir [dest-basename]

See pdumpfs(8).