I was recently viewing my WD Backup.swstor backup folder on my Passport device (6mo of use) and came across over 2.5million files under History and 1.2million under Volume (). These were located under my PCname/backup-folder…History and Volume. If you drill down to the AppData/Local and down to the Mozilla and all the way to cache2…you could have millions too. Try using Properties after rt clicking the folder…Viewing may affect your PC, gets stuck. Here are internet pointers files created when you view a URL…something like that. I was actually doing a scheduled backup of more files than I needed, daily. If you are a Mozilla user, check this cache2 folder on your PC. If you have not recently or never done a Cache cleanout under the Mozilla setting…you could have tons of pointers that don’t get cleaned out when you shut down…all being backed up. I changed my schedule to do only the stuff I really need for home, work, play and my Mozilla bookmarks. If my PC crashed, I will reload…at least I have my data, and I have an idea what I’m backing up.
As I’ve recently posted in this forum and the External Drive forum, you need to know how much data is sitting on you backups and the number of files…like mine, millions. I ended up using a free version of Treesize…after running for 5min, it presented a Tree structure of my folders/subfolders and the number of files and sizes (you can filter the display to sizes, files/etc…you can expand the folders and print for reference (I used the Snip routine to screen capture since pgm could not print the expanded tree). Also, drag the window vertically to give a taller window. Run this against you PC internal drives too to see where files are stored and how big.
After isolating the high impact folders, I went into the History and Volume() and did a delete (used the shift key to permanent delete). Took over an hour.