NB: You can't backup a live DB the way Paul has suggested (he does mention that).

If there is no problem taking the DB down for a few minutes after hours then no problem.

If you want to backup to tape, that's going to get a bit more complicated unless there is no problem taking the DB down before the backup and bringing it back up after the tape finishes (i.e. a longish time).
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)