It’s dokuwiki.

If you want something that works very well and is quite convenient, I can recommend the Scaleway S3 Glacier storage. If you only need a few GBs, it will only cost a couple of cents per month.

If anything, I feel like Nextcloud Mail is the thing that’s going to end up being killed, not Roundcube. Nextcloud doesn’t exactly seem like a company that would buy a superior product just to kill it off.

Would be interesting to hear a little more about your setup. I had some issues when I had Nextcloud installed directly on Debian (though nothing this major), have since switched to running it on Docker and it’s been very solid.

Immich is still in relatively active development, but has a great feature set and is the only app that could reasonably replace Google Photos for me. Can recommend!