Do you mean to create a backup copy? That’s called “imaging” the drive. You can make an image of a disk, but you can’t delete it, and the system must be booted from a CD, DVD, or other removable media, since it won’t work on the hard disk itself.
assistant
That would be a violation of someone's privacy.  How would they know you'd done it, and what's the reason you want to copy the hard drive?
assistant
Is there a way to mirror or copy someone's hard drive, maybe without them knowing?
user