GrandTotal 6 uses a new data format that can be edited by multiple users simultaneously. This eliminates the need to manually set a synchronization method. The file is simply placed in a shared folder on Dropbox, iCloud, GoogleDrive or similar and all involved people are able to work on it at the same time.
In the File menu you can display the file information. To see if the cloud service has synchronized all data correctly, compare the checksum of the file with the one on the other devices.
All data can now be protected with a password. The encryption is done according to the modern AES256 standard. A strong password should be used - this can be stored safely in the keychain. If a password is forgotten, the data will be irretrievably lost.
The end-to-end encryption of the data makes it impossible for third parties (including the cloud provider) to read the data. The data is only decrypted during it's use within GrandTotal.
Backups are created automatically by Time Machine. If Time Machine is not active, an adequate alternative must be used.
By using the new file format, multiple companies or mandates are also possible.