How to back up your Android device before a factory reset
(Android Police)

Update This guide has been updated to reflect recent changes to Google Photos and Samsung One UI. For most of us, the majority of our important data (messages, calendars, contacts, and so on) lives in the cloud. However, your phone or tablet might still have some information not being backed up to the cloud, depending on the apps you use and the sync/backup services you have enabled. For this guide, we`ll be going over some of the ways you can back up this data and ensure it makes it to your next phone or tablet. Read More How to back up your Android device before a factory reset was written by the awesome team at Android Police.