DriverBackup! is a portable open-source tool which displays, backs up and restores your chosen device drivers.

On launch the program displays your various drivers in a tree. This can be filtered to view "All", "Oem" or "Third party" products, individual drivers may be selected by clicking a checkbox, and there's even an option to back up their digital signatures.

When you're ready, clicking "Start Backup" saves the drivers to your preferred destination folder.

A "Restore" option can restore your backup at a later date.

Extras include the ability to back up drivers from an offline system (apparently only Windows XP-7 are supported), and a command line interface allows you to automate the entire process.