You can also set up a .vbs file to run at X time using Task Manager.
Code:
Option Explicit
Dim oShell
'open the Access file
Set oShell = CreateObject("WScript.Shell")
oShell.Run """C:\Program Files\Microsoft Office\Office15\MSACCESS.EXE"" ""C:\Users\mmickle\Desktop\Managed_Care_Database.accdb"""
When the script is executed it will open your database.
In the database you can set up an AutoExec Macro that executes on open. This macro should then contain script that checks the time.... if it is within a minute of when you specified task manager to run then it will create a backup file...else it will exit the sub... pretty simple to set up.