Backup software
For unix systems, generally a version of 'dump' (varying by
OS -- 'ufsdump' for solaris, 'dump' for linux) and restore are used.
These are relatively old protocols, but have proven hardy and able to
take advantage of new tape-drive technologies (greater capacities,
compressed tape formats), and simple to use for restores.
For disk-to-disk backups, 'rsync' -- a
file-synchronization protocol is used, which allows a form of
time-based images of selected file or filesystems. Files to be backed
up are thus copied to a completely separate machine and disk system.
