Okay, I finally managed to get a copy installed. There seems to be 2 options that look interesting.
The first is "Synchronize with Google Drive", that saves to a spreadsheet. It doesn't work for me, but if you've used it that can be a viable option?
The other is a backup archive. It seems to be SQLite files in a zip file. I'll investigate that further tomorrow.
If you can use the spreadsheet option that will most likely be the fastest route to getting your data into Diarium.
