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I have considered that exact message. It does seem making it easily plug and play may be out of the question if I want the error correction capabilities.
Btrfs and zfs are self-healing.
You can make a script to check for errors and autocorrection yourself but that needs at least a second hdd. On both drives are the same data and a file or database with the checksums of the data. The script then compares the actual checksums of the two copies and the db checksum. If they match -> perfect. If they don't match the file where there are two matching checksum is the good one and replaces the faulty one or corrects the db entry, whichever is defect. That's it. It doesn't have to be more complicated.
Yip I think this is the setup I will want (probably both - zfs + a custom script for validation, just to be sure). Two mirrored drives. I do need to read up some about zfs mirroring to understand it a bit more but I think I have a path to follow now.