Pmwiki: own format, no access control, I would say it is a bit outdated.

Duplicati or Borg for backups. Guis exist for borg as well.

I understood the repo changed hands in a shady way, with bad communication. Might be fine or not. I would also like to know, I’m not a user but was going to be just when it happened, and I postponed it

What about kde connect? Never used it myself, or syncthing for android either, I use a USB cable and adb for backups