universal4,
I generally use RAID in all important systems and have a seperate backup box with plenty of space to have a weeks worth of incremental backups for all the other boxes ( few hundred gb’s does the job ).
Late each night, the backup box runs a cron job to pull the incremental backup over the network using rsync ( via ssh ).
Basically you just rotate backup.day1 to backup.day2 and use the –link-dest flag of rsync, it makes a copy of the previous days backup using hard links ( very little space used ), then pulls the changes down and deletes the hard links to files that have changed and creates a new file.
So you have a week’s worth of changes incase shit hits the fan.
This is much faster then using tapes.
I use this for a hosting company I admin with many clients and a lot of data, never had the RAID systems fail, but if they do, i’m covered.
Regards,