Acronis True Image 2021: using two or more antivirus solutions on the same computer is not recommended

Symptoms

You have an antivirus or a different security solution in place and you want to install Acronis True Image 2021.

OR

After Acronis True Image 2021 is installed on a machine with a different security solution in place, the machine displays significant performance degradation, such as programs not running or running slowly, unexpected reboots, slow booting, etc

Cause

Two or more antivirus solutions are active on the same machine.