First, I configured a file-level backup. C drive was selected and showed "file level backup" next to it. I also unchecked some folders under C. The resulted restore point size is about 64GB. The unchecked folders are not backed up which is expected, but the files on root of C drive are also not backed up.

In my second test, I configured a file-level backup again but this time, C drive was selected and showed "volume backup" next to it. I also unchecked some folders under C same as in my first test, they are about 30GB. However, the resulted restore point size is about 65GB. The unchecked folders are partially backed up, I cannot figure out which files and folders are backed or not and by how. The files on root of C drive are backed up.

I run two tests in standalone ad-hoc backup.
Anyone experienced the same?