jader
That "tip" is a method created by one of the leading developers of sme server and is the recommended way of upgrading from sme6.x to sme7.x
There is no recommended "configuration only" option, as configuration details are contained in many different files. Were it as simple as you ask, a routine would have been developed years ago.
It really depends on what you mean by "configuration".
Perhaps you are just referring to the basic setup details that could be saved to a floppy disk in some older version of sme (was it 4.x or 5.x or 6.x that still had that option ?).
You can get a similar result using the backup server config method referred to here
http://wiki.contribs.org/Backup_server_configThere is also the Lazy Admin Tools (LAT) contrib.
As I said before and Charlie agrees, the UpgradeDisk method will be perhaps the easiest approach. It will transfer all your config and users and shared data and mysql databases, but not the installed rpms (some of which could be incompatible with sme 7 anyway, and there are quite a few additions to sme7 base code, which did away with the need for contribs eg spam & antivirus & RBL lists etc, so you do not really want to transfer data associated with those old contribs.
You must remove the custom templates referred to and generally follow the steps carefully.
Also the backup server config article has many other specific tips for doing partial upgrades manually and with care & understanding should be successful.
There is also other info in that same article about backup and restore inclusions and the important signal events.
If your current server is a domain controller and you do not use one of the recommended restore approaches, then you will lose the machine accounts, which means all windows workstations will have to rejoin the domain, and you may lose the User Profiles on the workstations.