[karmelapple]

Zotero's privacy features even extend to where data is stored: you can bring your own WebDAV server [1] and have Zotero store data there.

[1] https://www.zotero.org/support/sync#webdav

[Reelin]

You do realize that (unless something changed recently) all your metadata is still on their servers? Last time I checked, a Docker image of the sync server was in the works though.