Originally Posted by JaapJan
Why is a RAID 1 NOT a back up, it seems to me as a full copy of the "master" drive?
Drive 2 mirrors Drive 1. If Drive 1 becomes corrupted, a file is deleted, etc., Drive 2 will mirror the problem. RAID 1 is great for safety in case of drive failure, but you should really keep a backup of your data on another drive, preferably off-site.

561, DSP5500s, DSP5000C, analog sides and rears