I don't plan to run them all simultaneously. I'll have 3 data sets:
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My main storage 1 TB, with a syncing copy of the whole TB on another machine and 1 offline copy updated perhaps every few months.
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My family photos and videos, allocating 1 TB to the photographer of the family, with a synced copy attached to a digital photo frame.
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My home video media server hosted on a cloud storage app I wrote myself. I probably won't put in any redundancy for that set and will focus on size.
I haven't learned RAID yet, but will sometime.
Makes sense! Interestingly, my power is free in Hawaii.