[BrenBarn]

> I wonder how easy it is to backup a Matrix accounts's data. Conversations and files.

Not as easy as you might hope. The Element client has an export feature, but you have to manually activate it on each room/chat, and the export has a size cap so it may not work if you have lots of files you want to save. It's also pretty slow if the room has a lot of history. You could also try using something like Matrix Commander (a command-line client), but I couldn't get that to work fully either.