Oh, wow. Thanks! I didn’t even know Calibre-web already had that. Was looking at a different sync hack that would let me use Nextcloud, but this is even better.
Edit: Just set that up, and seems to be syncing. Looks like it pulls everything? Was naively hoping it would present my library as the “store” lol.
Oh, no, nevermind. Just sync’d the metadata and the covers. Still have to download them. Nice!
Thanks for that!
Ah, I see that option now (and the option for the shelves).
I may just leave it as “all” and keep the metadata for everything on hand and just download the full books on-demand. That way when I add new stuff, it’ll automatically be available.