"Dar is a shell command that makes backup of a directory tree
and files. Its features include splitting archives over several
files, CDs, ZIPs, or floppies, compression, full or differential
backups, strong encryption, proper saving and restoration of hard
links and extended attributes, remote backup using pipes and
external command (such as ssh), and rearrangement of the "slices"
of an existing archive. It can now run commands between slices,
encrypt archives, and quickly retrieve individual files from
differential and full backups. Dar also has external GUI like kdar
for Linux,thanks to the well documented API."