First, I suggest reviving this discussion on the NextCloud forum, looks like they’re trying to achieve the same goal
The question is, what does that involve? Keep users in sync it’s easy with NethServer 7, then you should keep mariadb and nextcloud folders constantly in syn.
Given everything, I still have no clue which issues you will face and how NextCloud will react to this “sync”. Most likely you have to execute occ:scan command each time.
I did read the articles, and the nethserver-ha docs. Will take a look at DRBD (tought I’m worried about performance, saying it from ignorance as I have no experience with it).
Thanks