rsync -avz --eahfs --progress --delete /source-dir-without-trailing-slash /destination-dir-with-trailing-slash

// explanation of switches
// -a, archive mode, equivalent to -rlptgoD which does things like recurse through all the dirs, preserves times, etc.
// -v, verbose mode
// -z, compress - makes the copy go faster. doesn't actually compress into a zip file
// --eahfs - (could also use -E, I think)
// --progress - show copy status of each item
// --delete, delete files on destination that aren't on source (sync)