Off load and play on Plex would be a fine solution. I mostly watch through Plex anyway.
BTW: SAGETV would absolutely do that. I had four drives in my media machine, sync’d to a NAS in the garage. When a drive died, I just dropped in a new one, copied over, and done. And easy to move from one folder to another; just point to it. I think the fundamental issue here is the odd, proprietary file system that Tablo is using rather than just industry standard. I suppose there is a good reason for that from your standpoint, but not from that of users.
Thanks @theuser86; I’ll dive into that.