Hi folks - Using Home vers. 11. I did a full backup, selecting those directories I wanted to backup - no problem, I did not select my entire C drive since I already made a complete "mirror image" of that onto another external drive. So now, I want to do a differential backup, updating those files I've either added or changed. When using the wizard it asks me the source, and I select "C drive", and I select "differential". BUT.... how does Acronis know which files I originally selected? Will it now add every last file off my C file. like system files, that was not part of my original full backup? I didn't want to proceed until I figured this out. Other backup software allows you to creat a "script" that you can run that limits the backup to the original selected file set. Is that possibile? Thanks for your assistance.