I have a VPS server and I have access to WHM so could I be able to restore my own cPanel backup through WHM?
Yes, as long you have root access to your VPS you will be able to easily backup and restore account!
We suggest you through to get an offsite backup or into your computer to be sure the data are safe.
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The cpanel backup feature is pretty good. But as others have said, you will need to have your provider restore it for you. But really that's a no brainer and it's fast. Just back them up and then download them to your computer. Computers die, hard drives fail, and you never know what may happen.