Right from day one I dreaded the thought of having to rebuild my Home Automation setup.
Making backups of your configuration files is the key, software can always be reinstalled (usually hassle free).
I placed a copy of my entire setup on a USB stick to move from one PC to another so I have setups on a couple of Laptops and a PC as well as on a USB stick.
When X10 WTI went belly up reinstalling AHP became a issue. Several of us attempted to get AHP to install without the registration nags. Installing the European version was the easiest solution but not the best.
I created a North American AHP installer but it still had the registration nags
As Brian pointed out the AHP-Lifejacket program will help remove the nags.
The key to retaining all your setup info for AHP and still have all plugins you now enjoy is :
1: Backup your x10prod.sys file found in C:\Program Files (x86)\Common Files\X10
2: Backup your ahx files found in C:\Program Files (x86)\ActiveHome Pro some have several
3: Take note of your Drive ID save this into a text file and keep with above files
The files you need to back up are mentioned as well in the AHP-Lifejacket thread.
Since you also run Alex10 backup the files in the Alex10 data folder.