I have a development server on which I want to keep certain data directories in sync with the live server. Any files in these directories which exist on the live server, but not on the dev server, I need to copy over.
Because I don't care about syncing from dev-to-live or have any concerns about overwriting data on Dev, I could just copy the entire directory over with SCP. The problem is, this folder is HUGE (several GB) and I want to sync it nightly. It would never finish in time.
What's the simplest/best way (via SSH) to sync/copy missing files from the remote directory to the local directory?
Note: I'd prefer not to install any new/custom tools if I can help it; I'm also looking for something I can setup/run pretty quickly & easily, without a lot of fussing or scripty-ness! :)