NS8 is completely new (container orchestrator application server instead of OS) and Samba changed too, for example we now are using samba registry (net conf) ...
Previous versions are generated with the snapshots. Open a doc, make changes, save it, run a snapshot, then a previous version of the file should appear.
None, it's not supported. Some or most of this functionality is provided via TAL and similar subsystems which only implements local filesystem support.
These are the latest stable releases of the Samba 4.22 and the Samba 4.21 release series. The uncompressed tarball has been signed using GnuPG (ID ... Samba 4.22.0 · Samba 4.21.0 · Samba 4.20.0 · Samba 4.19.0