Backing-up and migrating a Certificate Authority (CA) signed SSL certificates

I've recently installed a CA-signed certificate on our Mac OS 10.5.8 Server (our mail server). It is working nicely. The Apple documentation seems to omit detail on backing up and moving CA-signed certificates. Is backing-up as easy as dragging the certificate from Keychain Access to a folder (results in one 'mail.abt.com.au.cer' file) and backing it up? Or do I need to dig around in /etc/certificates and backup the related files... mail.abt.com.au.chcrt mail.abt.com.au.crt mail.abt.com.au.csr mail.abt.com.au.key And once I've backed it up, how do I reinstall the CA-signed certificate when I eventually set up a new Mac OS 10.6 mail server? Simply drag it to Keychain? Or drag it to "Certificate" section of Server Admin. Apple's server documentation seems to be somewhat deficient in this regard. If I don't get a response from anyone I'll experiment when I set-up with the new server and report back here. Thanks, Sam