Backing up

If this is a data file that is a protected file you need to be logged in as the Admin or at least in an account with Admin Privileges.

If it's a Windows file it would be best to make a copy to some different media, I've also found from personal experience that the Windows Backup tool doesn't like to run as a Scheduled task and that it's better to do this manually as this works better.

If you are attempting to use some Third Party Software to perform a scheduled Backup you'll need to rely on the directions that come with that software.

Col