Unfortunately the client indexes and media database are closely coupled and 
connot be moved in bulk independantly. Any migration other than a big-bang 
approach is going to be quite painful since a piecemeal approach will involve 
rescanning media to recreate the media indexes. If you do decide to move 
clients one at a time, ensure you introduce them on the new server with the 
same 48 digit Client id that they had on the old server.

>From a UNIX background, the way I would do it is to set up the new server - 
>install the Networker software (7.4.1 and 7.4.4 are similar and I don't 
>believe any data conversion is done on the upgrade) and get the tape hardware 
>working. Shutdown the Networker software on both servers, rename the \nsr 
>directory on the new server and copy the entire \nsr directory across from the 
>old one. Once copied, shutdown the old server and change the IP and hostname 
>on the new server to reflect the old one, reboot and start the software up. 
>You will need to rehost your licence keys for the new server and possibly 
>reconfigure the tape hardware if the paths are different.

Check daemon.raw log for any errors - indexes are all checked on startup. 
Ensure all your tapes drives can mount media and attempt to read a number of 
random files from different clients before running any backups
 
This way clients are unaware of a change of server, your media database and all 
your old resources (pools, groups, clinets etc.) are intact and your back out 
is simple - shut down new server and boot the old one. Main danger is that once 
you have written anything to tape on the new server, backout becomes nigh 
impossible :-)

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