By default, in Windows 10/8/7 & Windows Vista, Windows Backup notifies end-users to configure Windows Backup. Notifications can appear in the Action Center after seven days without having configured Windows Backup, or when an end-user attaches an external hard drive.
Disable Windows Backup Notification
If you do not intend to enable Windows Backup, and instead provide a third-party backup solution to end users, you may disable the Windows Backup notifications.
Windows Backup notifications are controlled by a registry key. This registry key is not present in default Windows installations. To disable Windows Backup notifications, you must manually add a registry key.
To do so, open regedit and navigate to the following location:
Now under WindowsBackup, in the RHS pane, open a new DWORD and name it as DisableMonitoring, and set its value to ‘1‘.
If this key is set to 0, or if this key does not exist, then Windows Backup will display notifications to the end user to configure Windows Backup.
If this key is set to 1, and an end-user has not already configured Windows Backup, then notifications to configure Windows Backup will not be displayed to the end user in the Action Center, or when a user attaches an external hard disk.
Sourced from: Technet Libraries.
UPDATE: You can also do the following. Open Control Panel\All Control Panel Items\Action Center\Change Action Center.
Check, uncheck the options you want, click OK and Exit.