If you still want to use Disk Cleanup, start the tool by searching in the Start menu or by pressing Win+R, entering cleanmgr ...

The Windows tool Diskpart overwrites all data on the hard drive with a zero, which is considered a secure deletion method. This applies at least to classic hard drives, i.e. HDDs with magnetic discs.

While there is no direct feature to clone a hard drive in the Disk Management tool, another method can still be used. Then, there are many free tools to clone a hard drive, which I will discuss in ...