Backup.py bug with datetime

[chaoscreater]

When I run your script on Windows, I get the following error:

OSError: [Errno 22] Invalid argument: 'backup-2021-08-10T09:26:37.344645.json'

The reason is because of the semi-colon (:) that is used in the filename. Windows doesn't accept : as a filename.

To fix this, change the Backup.py line:
now_string = datetime.now().isoformat()

into this:

now_string = datetime.today().strftime('%Y-%m-%d')