How Do I Create Automatic Backup At Regular Time Interval?

I would use robocopy for that task.

DamithSL solution is a good one, you should rely on built-in task scheduler to launch your batch regularly.

robocopy /?

in a console should give you plenty of details about differents options.
Robocopy will allow you to copy only modified and newer files; already-copied and unmodified files will not be copied again and again, which depending on your folder size can save a lot of time.

Hope this helps.