There is no auto backup of application option in Dynamics AX.
In the past, I used DOS command script to do the following in the mid night when it was acceptable for AOS to be unavailable -
1) Stop the AOS
2) Delete .aoi file
3) Used Robocopy script to backup the application layer.
4) Restart AOS.
The beauty with Robocopy is - it is intelligent enough so that only those files which had its timestamp changed would be backed up.
