Incidentally, only the main document with the file suffix ".gnucash" is required. You can e-mail/backup that file and you can also use the Android App that is

Incidentally, only the main document with the file suffix ".gnucash" is required. You can e-mail/backup that file and you can also use the Android App that is available to view it on your 'phone if you are an Android user. (Sadly the mobile app isn't available on iOS).