Does Windows 8 Automatically Backup Registry

I am seeing some vague references to older Windows versions automatically backing up the registry at startup and saving the backup in some folder..

Any definite information about this in Windows 8, and where any such backups can be found? How and when is the Windows Registry backed up in Windows 8?

If Windows doesn't do it, could you recommend a tool that can do it in the background on a regular basis? I really don't trust myself with this anymore....