How do I backup before upgrading to Android 7 without using Google Drive?

[AnotherElk]

In the broader sense of the topic title …

Creating a backup of user data using TWRP community edition

This is a #wiki post. Everyone can improve it, by clicking the green pencil above. This is a full guide on how to create a full backup of data and cache partitions on a Fairphone 2. We use the backup functionality of TWRP. Full backups are a great way to store a duplicate of all your important information on your PC. This way, if your Fairphone 2 is damaged or lost, you can go back to the previous state of the phone which is stored in the backup. Prerequisites The instructions below assume th…