MacOS and Active Backup for Business

Hello, I currently use Active Backup for Business on my NAS to backup my Linux servers. However I saw that you can also backup MacOS computers. I own a MacBook and an iMac. However the iMac is mostly locked but turned on.

Do Macs have to be actively used while backing up to your NAS or does this work even when the screen is locked and the screen of the iMac is black?