When you reinstall operating system, usually there is too much time needed to find, download and install drivers, and in some cases (for example if you reinstall windows on chineese tablet) search task of all needed drivers may become impossible. On Windows 8, 8.1 and 10 you can create a backup of all thirs party drivers with a single PowerShell command.
You should create a folde somewhere, where drivers will be saved, then run PowerShell as admin and enter the command:
Export-WindowsDriver -Online -Destination С:\MyDriversWhere C:\mydrivers is your created folder.
Thats all. After that you can save your drivers to usb drive, for example and after windows reinstallation, in device manager, for devices that could not find drivers, just set path to your folder.