Schedule file backup not running

I have set up a daily schedule to backup a group of fodlers in My Documents on Windows 7. It has run for some time now, but stopped last week. I haven't made any changes to this computer. It doesn't run in system tray, I don't even know when the program is working without opening the program and looking for backups.

Side note, when I open Acronis from start menu, I get a windows prompt: "Do you want to allow the program to make changes to this computer?"

I have incremental backups from, 17 of them, with days skipped each week from May to July. Is it that I've made no changes in the files on the days I'm missing from backups?