It's something we have been asking for but unfortunately there is no way of restricting a scheduled scan as one can with a manual one.
It will scan anything it finds, so best disconnect from the network when the scan is in progress or, if that's not possible, scrap the scheduled scan and just do a manual one.
My scans run in the middle of the night so as to have minimal impact. Finding them still running at 7 AM, when they started at 1 AM, is disconcerting.
I guess, if I am online on scan nights, remembering to do a lock down of the firewall might help. Alternatively, I could schedule a script to run to disconnect network drives prior to the scans. (and another one to reconnect afterwards). I'll give that a try. Thanks.
Good idea...all the best.