This folder is used by Windows for system-level functions. That’s why you can’t access it. Apart from Restore Points, System Volume Information folder also stores the content indexing service databases that are used for faster file searches, etc.

https://fossbytes.com/system-volume-information-folder-windows-shrink/

Pise tam teda, ze se muze vytvorit i na ostatnich systemech souboru, no kazdopadne na tech neni problem to smaznout, ale na NTFS by to mazat nemel, coz zrejme nedava. Ono na linuxu se na ext4 vytvari neco trochu podobneho "lost+found" nebo tak nejak.