Why Backup?

To recover data or files. Files can get corrupted, accidently deleted, hacked or hard drive could fail. 

Where to backup?

Use your Google Drive account to save all your files.  Since they are saved in the cloud, this will allow you to access those files on any device.

What to backup?    

Everything. There is no storage limit, so you can save any type of file.

How to backup?

Download Stream to sync your Google account to your laptop:

https://support.google.com/drive/answer/7329379?hl=en

Log in to your Google account.

When saving your files, select Google Drive from the options and select the folder you want to save the files to.