Interfering with resources are the onl problem i can think of. Http, ftp, and all that don't generaly take much out of your computer, though large file downloading or a lot of java scrips or somthing may. Simple fix though, don't open any browsers while recording. Turning off other programs is a good idea also. Nothing worse that goddamn msn messenger sounds bleeding into a good take.
Good luck, you indeed will need it.
Angermeyer