Google Backup & Restore
For starters, Google has you covered when it comes to most of the important contact and email information. All your app data (like game saves) calendar, Browser, Contacts, Gmail, Photos, Music, People details, and even more detailed things like Wi-Fi passwords and other device settings. All of this can be synced to Google’s servers with two or three taps in your device settings, and restored when you get a new device.
Head to Settings > Accounts (tap Google) > Select Google account > check everything you want to sync. Make sure under settings > Backup & reset this is all enabled as well. This is one of the most powerful tools for the important stuff, but we’ll go over SMS, photos, and more below. Backup & reset will save almost everything. A new restore function arrived with Android 5.0, and Android 6.0 Marshmallow made it even better and backs up everything. Like game saves, settings, app data and more. It’s a full solution here in 2016. But you’ll need to be on Android 5 or 6.0 Marshmallow.
As you can see above Google does a pretty excellent job backing up almost everything that is important.
Once you sign into your Google account on the new smartphone or tablet you’ll instantly have all your contacts, browser bookmarks, movies, music, and even photos if you select that option. Saving and backing up photos is another huge area of concern, so that’s our next topic.
The second aspect of Google’s built-in backup tool is for Wi-Fi passwords and other device settings. For this you’ll want to head to Settings > Backup & reset > and check Back up my data, and automatic restore. This will ensure all those deeper settings and passwords will be saved for you, safely on Google’s servers, and instantly returned to your new device. This is shown above, and again below for those on versions older than Android 6.0. It looks similar, and has the same options overall.
And for Photo Backup you can read this article Auto Backup Photos on Android Smartphone