This is because you didn't back up successfully. You can have other software backups, such as Tencent mobile phone shutdown, which is very easy to use.

Open Tencent Mobile Manager-Utilities-Micro Cloud Network Disk Backup,

In order to protect the security of mobile phones, harassment interception, one-click optimization and safe slimming are carried out.

High-end software management and smart phone management requirements can meet your needs in all aspects.

Tencent Mobile Manager not only protects the security of mobile phones, but also is the password manager of mobile phones.

Hope to adopt. Thank you.