I guess kinda low priority, as personally, i would need that for maybe 10 clients out of a few hundreds, but i mostly backup servers and i can totally imagine that peoples who backup workstations could use this.
It kinda seems logical that it would be supported specially for stuff like workstations and file backups only, use case would be :
Backup /home or c:\users every 6 hours, and backup the whole c:\ or / every week.
Typically you’d need a virtual client for this.
You typically have a lot of workstations with the same settings so a group make sense.
Maybe you dont want to bother with slow disk image on windows, or you run linux, so you don’t have disk image enabled and can’t use it to backup whole partitions.