system volume information large windows 10

Went back to google, found some info that said the System Restore Points (SRP) are stored there and to go in and delete them to recover storage. I understand that it not good to mess with 'system files'. Both have large files that I don't understand what/why they are there.

Tried Folder Size and found the same results. The Reflect backup on that partition is only 134GB. Shocked me see a folder on one of the partitions, System Volume Information, that is 535 GB. Then I ran across Tree Size and Folder Size in my google searches, downloaded the TreeSize program, installed it and open up one the 'full' partitions. I had unchecked the 'keep system files hidden' tab so I could open it and found I didn't have access rights, or whatever.

All four partitions didn't seem to to be very loaded with files. I was getting a notification that one of the partitions on each drive is running out of storage. I use two USB external hard drives for backup of my laptop and desktop both of which have two partitions.

System volume information large windows 10