Configuring rsnapshot to backup multiple computers - individual exclusion rules

Question

I've got rsnapshot set up to backup two computers on my local network, as well as the server it's running on. How do I specify individual exclude sets for each backup? As it stands, I have individual cronjobs for each computer, each with its own rsnapshot.conf file. This would be fine, but I get three additional copies of hourly.* in my backup, which indicates that there is some redundancy going on in my setup. Do I have to write backup scripts for each one and have the excludes in there instead of in the main .conf file?