backup to windows computer

There are two methods by which you can back-up your iPad. The first is to iCloud - and requires nothing more than you iPad and an internet connection. The second is to backup to either a PC (with iTunes installed) or a Mac computer (with iTunes or Finder - as appropriate for the installed version of macOS):

How to back up your iPhone, iPad and iPod touch – Apple Support

For PC, you will require a copy of iTunes. For a Windows 7 PC, iTunes can be downloaded directly from Apple. For Windows 8 and 10, iTunes is downloaded from the Microsoft Store:

Download and use iTunes for Windows – Apple Support

Update to the latest version of iTunes – Apple Support

Here are the steps you need to follow:

https://support.apple.com/en-us/HT203977

Yes.

Install iTunes.