I use a tool that I bought called Resilio Sync that has good usability, but not the flexibility that something like rsync would have. Thanks for the advice.
Also, the -P option (at least on the version I have installed) is for enabling both --partial and --progress. --partial keeps partially transferred files in the event something goes wrong, and --progress shows you the progress of the transfer.
You will probably want to use -r for recursing into your directory structure.