I may be in the wrong forum, so please direct me if needed.

I have approx. 300GB of data that I would like to copy to a "second" server
1 time. From then on I would like to have the copy synchronized to the
primary server data. It would not have to be real time synchronization, but
possibly copy across the changes once a day.
Also, this second copy of data would never be backed up.

It looks to me like NRS would have done this for me previously, but I
believe that is no longer available - correct?

I am currently running 5.1 with the intent of going to 6.5.

What are my options?

Thanks for your suggestions,