Thanks for the responses.
I have been leaning towards paper for a while since I want to create a real Book in paper format anyway and I will print several copies. For a shorter term I will backup my RM database and execute the Dump command hoping that at some point these files could still be readable. My time frame is more like the next 50 years rather than millennium and with the multiple formats it may survive.
Jerry I like your suggestion and I wonder if the RM folks would include a hammer and chisel with each release of their software. We could provide the stone tablets.