You can do it using two steps
1. To use the Ontime method to start and stop the timer
Application.OnTime TimeValue("11:00:00"), "StartProc"
Application.OnTime TimeValue("13:00:00"), "EndProc"
2. In the start proc you can give the necessary code for backing up data and then increment the OnTime Event Counter
Good luck
Shasur
http://www.dotnetdud.blogspot.com