Hi Chris,
You only need the home folder of the 1.60 (i hope you mean 1.60 with v1.6) and of course a backup. But keep in mind that SCM-Manager v1 uses absolute path for the repository locations (if I remember correctly). So place the home folder from the old server on the same location on the new server.
Then install SCM-Manager v2 and configure the home folder location, if it is not the default location, and start.