Link-backup does this as well, plus it knows how to build hard links to old backups even when directory structure or filenames change, effectively de-dup suppor

Link-backup does this as well, plus it knows how to build hard links to old backups even when directory structure or filenames change, effectively de-dup support. It does this by building a content addressable index on the destination filesystem that backup trees hard-link against. http://www.scottlu.com/Content/Link-Backup.html http://www.scottlu.com/Content/Link-Backup.html