what is the best way to move data between clusters.  we currently have a 4 node prod cluster with 80G of data and want to move it to a dev env with 3 nodes.  we have plenty of disk were looking into nodetool snapshot, but it look like that wont work because of the system tables.  sstabletojson does look like it would work as it would miss the index files.  am i missing something?  have others tried to do the same and been successful.