Norton backup help please

Hi

I'm having issues with hard drive space so I ran WinDirStat and found out that N360 backup is using 99GB of my 150GB hard drive. Brilliant!! How can two thirds of my hard drive be taken up by backup files?

So I'm guessing that it's hanging on to old files or duplication them.

How do I proceed? obviously I need to delete something but what is the question is what? I tried backing up on-line and then reselecting the C drive and deleting the backup set but it only got rid of 3ish GB.

I tried finding the backup files with explorer and when I open that I get a number of files labeled 0 through 9 and A through F, the range in size from 5GB to 9GB and each one shows today as the last edit so it looks like all have up to date info in.

 

Any help would be greatly received.

Graeme