How to disable Windows backup notification on Windows 10/8/7
In Windows 10/8/7 & Windows Vista, Windows Backup notifies the end user to configure Windows Backup. Notifications can be displayed in Action Center after seven days without configuring a Windows backup or if an end user has connected an external hard drive.
Disable Windows backup notification
If you do not intend to enable Windows backup and provide a third-party backup solution to end users, you can disable Windows backup notifications.
Windows backup notifications are controlled by a registry key. This registry key does not exist in standard Windows installations. To disable Windows backup notifications, you must manually add a registry key.