Computer backup

[WaltR]

I finally upgraded my EMachine laptop. It has served me well since 2003. I want to use this as my backup computer. The hard drive is not large enought anymore with all the songs I presently have. Here is my question: I have an external hard drive that I use to backup my KMA files. I also have these files on my new laptop. I want to use my backup computer to access the files on the external hard drive. How can I do this so that the songs will still match my songbook? If I have to use the backup laptop with the external drive I want it to match my main laptop's internal drive. I know I can delete the files on my old computer and rebuild using the external drive but I'm not sure it will match the new computer as mentioned above. I hope I am making this clear.

Walt