I am trying to schedule a backup of the REST services.
So, I am running the script with Admin credentials on CMD window:
C:\Python27\ArcGIS10.8\python.exe "D:\ArcGIS\Server\tools\admin\backup.py" -u xyz -p xyz -s https://xyz/rest/services -f "D:\GIS_Data\backup
but I get this error

I double checked the credentials and the server url and are correct.
I am aware that I can back up the REST directories by using the
https://xyz/admin/exportSite
and just define the destination, but I need to schedule the task.
Ideas?
Thanks.