The remember password function doesn't work for restoring system

[Eason]

The remember password function doesn't work for restoring system.

系统恢复功能中的记住密码功能不起作用

Steps:
1. Enter into system settings-->Backups
2. Click "Back Up Now.." to backup the system, during backup system, pls set a password.
3. After backup completely, click "Restore.." button in Backups page
4. When enter the "Encryption Password Needed" page, select "Remember Password"
5. After restore system completely, click "Restore.." button in Backups page again
6. Check the "Encryption Password Needed" page
-->Failed. Still need input password

Configuration:
PC: Dell Vostro
OS: Ubuntu Kylin 14.04 Trusty Daily Build 1009