What is System Volume Information?
Introduction to System Volume Information
What is System Volume Information used for?
So why does this thing happen?

This is because Windows uses this folder for certain system-level features.
The IndexerVolumeGuid file is used to assign a unique identifier to the drive.
The WPSettings.dat file is also created by Windows service, but the function of it is not sure.

How to Reduce the Size of System Volume Information?
Is System Volume Information large?
This is because it contains your system restore points.
So how to reduce the size of System Volume Information?
you’re able to delete some restore points.
Here is the tutorial:
Step 1: OpenControl Paneland then chooseSystem and Security.
Step 2: ClickSystemand then clickSystem Protectionin the left panel.
Then clickOKto save changes.
Can I Delete System Volume Information?
Actually, you shouldnt delete the System Volume Information folder.
You cannot access it on NTFS-formatted drives, leave alone deleting it.
However, you could delete it on exFAT or FAT32 formatted drives, Windows will recreate it again automatically.
So there is no need to delete it.
So if the folder is too large, just reduce its size according to the method mentioned above.
Never give a shot to change the permissions on the folder to delete it.