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