What actually counts as a copy under the 3-2-1 rule, why a RAID mirror or a snapshot only protects against one kind of failure, and the one-page inventory that exposes the gaps.
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Disclosure: this is my own article (Charles Hartmann, Homelab the Right Way). Written with AI help and edited by me; the setup described is mine.
That’s the hard case. When you can’t predict what a client will ask for, backing up the whole project folder is simpler than trying to pick files, and moving finished projects to an archive keeps the active set small.