GarageSale disk useage

Where do I find the size or amount of space that GS is using on my drives and backups? 3-4 years ago I reduced the size of GS by throwing away duplicates and very old listings line by line in GS. Keep in mind my total number of listings currently is 10,000 listings with the average of 10 pictures in each. I cut each listing down to 1 photo to have a record of the sold item. This improved GS speed and lag issues. I should do it again because its been awhile and hesitating and lags have returned. The spinning ball Devs tell me is resizing being done by GS(version 9.9.3 GarageSale changed to a different API for resizing images) so I am running 9.9.2 (still have spinning balls but 9.9.3 is where GS Devs told me they made the change). see Spinning wheel ball of DEATH is really choking use of GS