Zte T22 User Manual page 22

If you are unsure about proceeding then touch the Back Key.
WARNING! If you interrupt the encryption process, you will lose
data.
6. Touch Encrypt phone.
7. Enter your lock screen PIN or password and touch Next.
8. Touch Encrypt phone again.
The encryption process starts and displays its progress.
Encryption can take an hour or more, during which time your
phone may restart several times.
When encryption is complete, you are prompted to enter your
PIN or password.
Subsequently, you must enter your PIN or password each time
you power on your phone, to decrypt it.
Back up to your SD card
Select Home Key > Apps > Backup & restore.
Select the MY DATA tab
This will back up your internal data such as Contacts, Messages,
Call logs, Bookmarks, System settings, Alarms, Home settings,
Calendars and Notepad to the SD card.
Select the MY APPS tab
This will back up all your installed Apps to the SD card.
22