Backup Your Files
This is an extremely important step to take before you install Android 7.1.1 on your Pixel/Nexus phone or tablet.
Before you install Android 7.1.1 Nougat you'll want to make sure that all of you precious files/data are backed up.
First, you’ll want to ensure that Auto Backup is turned on for your important files. In order to do this, head over to Google’s website. The company offers in-depth Auto Backup tutorials that will ensure that your precious files will be stored safely.
Both of these will come in handy ahead of your Android 7.1.1 Nougat installation.