Vinh,
I assume by the date of your post that you are not looking for an answer to your question anymore. However, in case you are; I'll do my best. If you simply wanted / needed to upgrade your CUACA to a newer version. And, let's say the underlying SQL and Windows OS was still compatible or supported by the newer / upgraded version of CUACA. In this scenario it's as simple as running the CUACA installation file. During the installation process it will find the current SQL "configuration" and "logging" databases already installed. You will be prompted to keep them or overwrite them. In your situation you'd want to keep them of course. That would be it other than reloading a new license. However, if you need to move to a newer SQL and Newer OS, in this scenario the above process would not work properly. I don't believe you can or that Cisco supports you attempting a GUI backup and restore from one SQL version to a newer version. Therefore, you would need to build new servers to the specifications listed in the Admin and Installation guide for your version. Cisco will not support you exporting and importing data from the SQL tables / database. Our install wasn't too large. Therefore, I configured all of it on the new servers manually and then found a way to export the "Speed Dial" table from SQL and import them into the new system. Again, not supported. But, much better than telling users that they have to re-configuring thousands of speed dials. It's been working fine for more than a year now. Once the new server is up and running you can build your second one and install replication between the two of them. Do the installation and the replication both during off or low business hours. Because, the services are stopped on the primary during these processes. Once complete you will need to install the HA license.
