Basically title. Is it common to use some kind of RAID for backing up other RAIDs or do people just go with single drives?
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2 Single drives means 2 full copies, one you can keep at a friends place. 2 mirrored drives means if you accidentally overwrite a backup, you have lost both drives to the error, unless you have snapshotting or imcremental backups.
Lots of good backup advice on this podcast https://2.5admins.com/
