Can I delete any of these items from library?

I erased my hard drive and installed Big Sur from a bootable hard drive. I don’t know why it takes up almost 15GB on an erased hard drive.

Update: I just noticed on Disk Utility that 14.9GB is used for snapshot name: com.apple.is.update-{a long list of numbers}. Any ideas if there is a safe way to delete a snapshot? I don’t know if these is stored with the VM.

Solution 1:

Okay, apparently this is normal. Saw a discussion stating that the 15GB volume secured files from malware according to this discussion on an apple thread. So I guess it has to stay. https://discussions.apple.com/thread/252032330