How to back up your Android phone before a factory reset. Even though most of your phone’s data probably lives in the cloud, there could still be some locally-stored photos, videos, contacts, calendars, and other important files not backed up.

In this post, we’ll go over how to check that everything on your phone is properly backed up, so you can wipe it without thinking twice that you lost something.

Check account sync status

First, you definitely want to make sure that your Google account is syncing properly with your phone, so everything that should be backed up is actually being backed up. Open the Settings app, tap the Accounts option, select your Google account, and verify that all the apps and services under the account have been synced recently.

If some of the services haven’t been synced recently (for example, if you haven’t opened one of the apps in a long time), tap the Sync Now button on the page. Depending on your version of Android, the Sync Now option might be under a menu.

Make sure your photos are backed up

If you use Google Photos to back up the photos and videos you take with your phone, you should make sure it’s still doing that. All you have to do is open the Photos app and look for the cloud checkmark at the top, which indicates everything has been backed up.

If you previously turned off cloud backups in Photos, open the side menu, tap ‘Settings,’ and select ‘Back up & sync’ to turn syncing on. Super easy.

Of course, there are plenty of other photo backup apps for Android, including OneDrive and Dropbox. If you’re using one of those, go into the app’s settings and check the current sync status.

If you don’t like using photo backup services, you can also simply copy all the images and videos to a flash drive or your computer.

Source: https://www.androidpolice.com/2019/11/06/how-to-back-up-your-android-phone-before-a-factory-reset/