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I use rsync and amanda. Rsync is nice when I have lots of extra disk space.
Amanda is nice for running a tape drive.
We have 500Tbytes of data and do not have bandwidth to run full backups of all these data.
Rsync is used to capture only the changes.
Caution: when using rsync with the --delete function, be sure there is good data in the source directories.
I was burned badly when a cron job kicked of a rsync task with the --delete option and the
source was an empty diretory. All data in the target directory was be ERASED!
Distribution: Solaris 9 & 10, Mac OS X, Ubuntu Server
Amanda has a large user base. They don't make much noise, because it pretty much just works once it's set up. I have several Amanda servers working across several departments, and I just keep a casual eye on them, occasionally reviewing and checking backups. I once had a major tape drive failure that took a few days to resolve (hardware repair). I didn't have time to worry about Amanda. On its own, Amanda saw the tape drive failure, checked how much holding disk was available, and dropped back to incremental backups only, to conserve space. It sent me a report and continued working that way until the drive was back up. When the drive became available, Amanda saw it on its own, flushed all the incremental backups to the next tape, and proceeded to catch up with full backups. Pretty amazing and intelligent. I never had to touch it through the whole process.