Rsnapshot

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Crontab

2 4 * * * rsnapshot daily
2 3 * * 0 rsnapshot weekly
2 2 1 * * rsnapshot monthly

FAQ

Copying your rsnapshot archive to another filesystem

cd /rsnapshots
tar cf - . | cat | (cd /newrsnapshots && tar xbf 1 -)

cpdup, cpio etc fail when there's too many hardlinks: they will run out of memory.