I just got NTA installed and working about a week ago. I was trying to keep an eye on the database size to judge how long to retain data. The actual Data folder is about 1Gig but there is a folder called _leftOvers that is 10Gig. Is that normal or something that can be cleaned up? Thanks!
I know this is late but in case it turns up in someone's search, you can delete the files in this folder.
See here for more details.