How to synchronize SMS in the cloud?

Mobile phone settings -iCloud- Backup -I cloud cloud backup can turn on cloud backup.

As for what to back up, you can choose what needs to be backed up in the settings-iCloud, such as photos, text messages, address books, etc.

It is recommended to back up to icloud cloud with wifi connection.

Or you can connect a computer to download itunes, and then choose to back up the data to your local computer, www. That's enough. I hope so.