Large number of files w/deep scan

Hi,

Brand new here however I did do some searching first. A regular scan found 94,579 files. A deep scan which is still running has found, so-far, 332,301. As current progress grows this number seems to have settled down. My questions are why the huge difference and should I be concerned? Should I recover all 300k files?

These totals, even the 94k number seems quite large also, This was only a backup drive.

Thank you,

Don