There are a number of backup options available. After two years of trying several, the easiest I've found (after working through the learning curve) is
DAR . It's mostly a set of scripts, easily edited if you follow the TUTORIAL step-by-step. It's advantages over other options:
a) each file in the backup is seperate from all other files, making it easy to restore one file, or one directory. Same applies to compressed backups, as opposed to tar, which includes all files/directories in one massive archive, which is totally hosed if even one file is corrupt.
b) if a data file is corrupt, you can skip over the corrupt part, and restore the rest, in hopes that you can re-create the corrupt part.
c) ease of use.
d) ease of restoration from archive.
Check it out; see if it meets your requirements.
Cheers
PS: I backed up a 7 gig installation into a 2.6 gig backup file, using the file compression options . I still have the option of cutting that one file into slices for cd/dvd record. Haven't tried that yet; but I'm thinking about it.
PPS: you can easily specify file extensions to NOT try to compress, because they're already compressed; directories to NOT backup (but preserve the directory tree); files/directories to include/exclude; etc. When I finally tried DAR, I found what exactly what I wanted in a backup tool. YMMV