That's essentially what I do. Bunch of drives, each formatted individually, then pooled with MergerFS. Get a new drive, add to the pool. If a drive fails, it only loses that much of my backup; rest of the disks are unaffected. All the advantages of storage pooling without the redundancy (which here is useful).
this post was submitted on 02 Nov 2023
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daily / weekly power on, rsync pull from your data, then power off?
My cold storage is another Truenas box that powers itself up once a month, pulls an rsync and shuts down 2 hrs after that completes. Not quite what you asked for, but I don't have to think about it. The drives in that server are the smaller drives (2-4tb) that have been in the main Truenas box and been retired from that duty.
I have a MD3200 coupled to a R510 that I plan to do exactly this with. i have 12 4TB drives in the MD3200 and 12 2TB drives in the R510. Monthly zfs pull is my aim. Once I work out how to use the MD3200 that is!