Since you have previously stated that you have no formal 4K training, I just want to be certain that you understand that the AP-E has an Assistant,also.
Within the AP-E's Assistant, the AP Backup Server is also configured, but with one parameter distinguishing it from the Host's AP Backup Server.
You obviously have a schedule created to run the AP Backup. This backup runs on the HOST. Every ten minutes or so, the AP-E checks with the AP Backup Server to see if new backup info exists. If so, then the AP-E requests that the contents of the new AP Backup at the Host be FTP'ed to the AP-E. This process should not interfere in any way with the NCUI board. The AP-E and the NCUI are totally separate entities residing within a common cabinet: separate LAN connections, and separate power. I think that your AP Backup Server configuration is screwed up at either the Host or the AP-E, or BOTH.
As I previously advised, it would be extremely helpful if you could find a way to post a picture/screen capture of the Host -> Assistant -> Software Management -> HiPath Backup & Restore -> Administration -> AP Backup Server configuration. I know that posting pics is possible, as I saw some on this site recently. But to be honest, I do not see how to insert pics, either!!! Perhaps someone can help by explaining how to post a jpg. You should be able to take a "Print Screen" or perhaps use the Windows 7 "snipping tool" for a smaller jpg.
AND, a picture of the AP-E's AP Backup Server configuration (exact same path).
When you say that the "IPDA" is crashing, do you mean that telephony is failing - meaning that the NCUI board is rebooting? Or do you mean that the AP-E server is going down?
The IPDA should reboot from the AP-E's hard drive ONLY if connectivity to the HOST is lost for several minutes (see my previous post on another thread).
The Backup/Restore process has NOTHING to do with the NCUI board - UNLESS there is something wacky like a DUPLICATE IP ADDRESS.
Another possibility is a power problem, causing the IPDA/NCUI to fail .
I would LOVE to help you. This application is one of my areas of expertise. But I cannot help you unless I know the ENTIRE set of data!
Hopefully you have contacted SEN BLS, not a vendor. SEN Technical Assistance should be able to diagnose the problem.
Good luck.