Backups & restore points · Where backups go
Can I back up to the same drive my files are on?
Short answer: Yes, but Storage Studio warns you: it protects against mistakes, not against that drive failing. Add a second destination on another drive or a cloud account for real protection.
You can, and Storage Studio will let you — but it shows a warning: "This is on the same drive as your files — it protects against mistakes, but not against that drive failing."
A same-drive backup still lets you undo a deletion or go back to an earlier version. What it can't survive is the drive itself failing, being lost or being stolen, because the originals and the backup go together.
Add a second destination on another drive or a cloud account for real protection. See backing up to two places.