lol, it must be --magic
but seriously, not 100% sure about using it across two different domains, but gdrive allows for that, so rclone makes use of it.
a simple test using a debug log would give the answer.
as for the script, it is over 600 lines, runs only on windows and orchestrates
Microsoft VSS - Volume Shadow Copy Service, snapshot technology for backing up in-use/open files
complied as a portable .exe file
i have been thinking about writing a post about it here in the forum, and if there is interest, posting it at github.
tho i am not a professional programmer, i have been using it for approx. two years on a bunch of desktops and servers.
if you have a specific question about using python with rclone, please ask....