RAID 1 is a very poor backup, for several reasons. For starters, anything bad that happens to one copy is likely to compromise the other copy. Deleted or corrup

RAID 1 is a very poor backup, for several reasons. For starters, anything bad that happens to one copy is likely to compromise the other copy. Deleted or corrupted the file? Oops, it was mirrored to both disks. PC stolen? Oops. Water damage in the office? Oops. Raid controller died? Oops.