I currently only have a few test sites on my machine, all I can say is often (not always) and depending on when my monitoring apps check poll the machine (i.e. a cpu, memory usage and a http pull on a site or two) the CPU is flatlined and the http poll fails, claiming the site is down.
Now it may be because the web site app pool has recycled or something and the process is unable to restart because of the high cpu usage, I don't know. It would be nice if there were a simplistic way of restricting how many cpu resources AISBackup (or any process for that matter), but I've been unable to find any. There is the System Resource Manager (WSRM) that was just released, but that only runs on Advance and Datacenter version of Windows 2003.
Many applications have throttling functionality, I have no idea how they do it, just that they can. Perhaps you cook hook into a cpu/process performance counter on NT/2k/2k3 and use that as a self throttling mechanism?
Sorry I'm so demanding, you have a great product here, If there is no way this can be done, then so be it - it's a great product without this functionality, then again, if you can make it work, it would an unbelieveable product