Hey @Donatbms!
I can definitely help you out with that! You can back up your messages in the cloud with AT&T Messages for Android smartphones and tablets. You’re able to download the app start from Google Play to get started 
There are a couple of websites through AT&T directly that will give you a pretty good run through of the article AT&T Messages app for Android. It will have all the information you’ll need to know how it works and how to download it.
To get started using the AT&T Messages app for Android devices:
- Download the AT&T Messages app from Google play:
- Smartphone - Download AT&T Messages for Android smartphones.
- Tablet - Download AT&T Messages for Android tablets.
- After downloading the app to your device, select the AT&T Messages icon.
- Accept the terms and conditions.
- Follow the prompts to begin setup.
For additional information, you can also take a look into the Overview and FAQ through the main page.
If you still have questions and want to learn more, don’t think twice about reaching back out to us here on forums! We’re here to help! Take care and have a fantastic day!
Kevin, AT&T Community Specialist