Hey, thanks for the feedback! Yes, currently in the preferences you can see the path of your local SQLite DB file, so you could definitely sync that to the cloud.

I will improve it further in next releases to make it even simpler (for example, by defining a custom path for the store, which cannot be done currently), but it can definitely be done already.

Regarding the key for recovery: you can already do it. Mini-Diarium already supports both password and public key authentication. So you can use the password and generate the .key file and keep it in a secure place as a backup in case you forget your password (or do it in reverse: use the key file and have the password as a backup).

Thanks again!