I was told that I can re-install an app safely using snap remove brave and then snap install brave without losing the app data, so long as you don't add --purge.
So this is what I did. During the remove step there was a message: "backing up data for #112". I then re-installed, ran the app. Yeah, all data is gone, complete blank slate...
My question is: Is there ANY other location where the data might have been backed-up to other than /snap/<app>/ where I can restore it from?
EDIT: Just discovered that the data was saved:
~ » snap saved andre@andre-office
Set Snap Age Version Rev Size Notes
31 brave 51.5m 1.24.82 112 1.72GB auto