I'm trying to help out one of many collectives stuck on Crabgrass (https://we.riseup.net/), but most tools I can see don't really seem like a much better option. If not that the software is really ageing and is very much not adjusted to mobiles - it would still serve pretty well.

In this case it's some 40 users, with mostly very little computer skill and old hardware and many years of notes and documentation to be moved. Some of it could be public or semi public (think volunteers), some is for the collective eyes only or an even smaller internal group.

Nextcloud with the Collectives plugin would be the most obvious choice... But from what I understand/tested there's no way to stop anyone with access to the notes from ie. downloading or deleting them all. I'd expect that to at least be impossible by mistake, and preferably somewhat more complicated to do for anyone.

Most other tools I've seen are either crypto-, esoteric language based maintenance nightmares which will be a overkill, or a pure wiki, which tends to be confusing for non-tech's or a niche French software for associations.

I'm interested in what would be a actually 'battle tested' software for internal use and how if fares against an old drunk punkrocker or in another extreme a deliberate sabotage attempt.