When I do a backup on my desktop version of manager (20.10.12) the application freezes and becomes unresponsive and it has to be closed using Control Alt Del.
Mac version 20.10.13 also has the same problem on MacOS ver 10.15.7. It will just show the ball of death and become unresponsive. Although I started seeing this problem on version 20.10.10
Fixed in the latest version (20.10.16)