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RAID != Backups

RAID is not the same as having backups, people. With a RAID-5, you can handle a *single drive* failure with no downtime, but if multiple drives fail, or the raid controller fails, or if you’re rooted and all your data gets deleted, then you’re screwed. Stop thinking that RAID makes you immune to data loss. If you’re paying for RAID, pay for 1 more standalone drive to hold your backups too. To do anything less is just irresponsible.

If you think your RAID is safe, check out the stats here:
While pondering those stats, be sure to remember that they do not consider the possibility of a hardware failure of the RAID card itself.

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