RAID is not a backup.
The simplest way to remember how to back up your images safely is to use the 3-2-1 rule.
Keeping 3 copies of any important file (a primary and two backups)
Having the files on 2 different media types (such as hard drive and optical media), to protect against different types of hazards.*
1 copy should be stored offsite (or at least offline).
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"Wake up, Luigi! The only time plumbers sleep on the job is when we're working by the hour."
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