Need Suggestion on NBU setup

Hi All,

currently we are running NBU 7.0.1 on 2k3 & 2k8 machines, we are having around 30 Master servers which are not having more than 3 clients, only 2 Masters are backingup 20 clients.now we had license for 7.6 whcih includes MSDP & dedup, now my client wants to make all master servers as media servers which will have storage attached to make as MSDP and maintain only 1 centralised master server, and our Long term retention is 3 months. now how can i configure the same setup? is it possible only by moving Catalag DB to new master server? if yes please help to route in correct way.