Making a regular backup of registry is a good habit to save your PC from unexpected errors and blocking of some features. Registry is a database for your machine, it acts as a mediator to the programs to work. If your PC registry corrupted, probably it have a chance to mess with your system and you can expect unexpected errors and failures.
While performing fix to a registry it is always suggestible to take a full backup of your PC registry. A simple built in feature comes with Windows Vista, 7 and 8 will lets you to take a full registry backup of your machine.
How To Backup Registry In Windows Vista, 7 and 8-Simple Guide
Registry Backup or Exporting Registry
Follow these simple steps to backup your registry.
For Windows Vista, 7, 8- Open start menu, type “regedit” in search box.
In the registry editor go to File menu->select “Export” option and under the saving window export range select All.
For Import and Fixing Regestry
Same as above, in the registry editor file menu->select “Import” option and now select the registry file (backup made earlier). It restores your earlier settings in the registry.