Although I don’t know macOS, I think it’s the same design as Windows and Linux. Their answer is “yes”.
See BaseVersionName (likely 2.0.5.1) and ServerVersionName (likely 2.0.6.3) in About → System info
Yes and yes.
These should both get on the new version. The only difference is where the new version is in filesystem.
There are some subtle factors, such as that update files are integrity-checked, and are ignored if wrong.
Also the Activate button is not reliable and sometimes a manual Duplicati start is required to get back up.
No magic, however updated version will sometimes update the server or job databases to a new version.
This makes it difficult to downgrade, and especially annoying if updates loses integrity and you go back to base version. For your remote users, a maybe longer but more predictable procedure is to use Duplicati updates notifications as a notification, but actually have them go do a manual install of base. My opinion…
An example of the mayhem caused by an updates folder somehow getting some extra things in it is here:
If you mean in the Settings page under Update channel in Default, the default update channel is set by the base version which is 2.0.5.1, but the channel itself would be Beta, because 2.0.5.1 was a Beta. That doesn’t mean you’re on 2.0.5.1 now. Look at the About screen or About --> System info for versions.
On the line above your quote, it probably says Default (Beta), then your line goes into more detail on it.
How are you seeing anything in the UI if
For me, an Activate failure doesn’t reconnect the UI because there are no Duplicati processes, so I do a manual start. If you see processes up, maybe you can check start time to see if they’re new or leftovers.
2.0.6.3, though, seems like it couldn’t have been old if you just installed it. Did you set up a UI password?
is a false alarm I sometimes get that I can clear with a browser refresh. I’m thinking of filing an issue on it.
If family is willing to do this, then install and reboot (rather than trying chance of activate working) may do.
Unfortunately I have no Mac, so can’t say how easy it is to nicely stop or kill and start things like Duplicati.