So excited to consolidate my mess of drives and get a big boost to my storage.
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Sounds like it's time to get a NAS and make a RAID array. Btrfs, mergerfs, Synology's SHR, TrueNAS's multi drive size solution, and probably some other options I'm forgetting can accomplish RAID 1 across different drive sizes. Then your files are duplicated to other HDDs in case one fails. Then you can back up to Backblaze B2 to make sure you your data's backed up off site.
You can do a mixed drive raid solution on Windows with Windows Storage Spaces and backup to Backblaze computer backup for pretty cheap.
This is the upgrade I've been planning going from a 2 bay to 8 bay NAS. My wallet is not very happy with me... But the homelab must grow.
I'm glad my wife doesn't mind the 5 bay. Or the 8 bay I added to become the new main NAS and the other a backup.
..... Or the 4RU case stacked with drives.