be> unstable Ubuntu is that I always had problems when I tried to upgrade
 be> Ubuntu version. Actually it just won't update and it crashed, so I had
 be> to reinstall Ubuntu (just like Windows).

Come to think of it, I did have a similar problem when I upgraded from Ubuntu
18.04 to 20.04 LTS. So then I ended up having to re-install all my junk
afterwards which was not a smooth transition.

 be> talking about storage. If both have ext4 you are good to go (maybe,

With that being said, it sounds like it might work. I run my BBS on a VPS that
only allows me to choose between Ubuntu (a few versions) and CentOS (which is
not something I want to try out.) I often compress the BBS & download it so I
can work on it on my local machine, then I upload it back to the VPS when I'm
done. I've assumed that both machines need to have the same OS, but like you
said - if they have the same file system, it might be just fine.

--- Mystic BBS v1.12 A45 2020/02/18 (Linux/64)