Hello there. I'm running Lightroom on a comparatively new Macbook Air, and all of my photo files (a mishmash of folders from old machines + Dropbox automatic uploads) are really starting to clog up the tiny hard drive. I want to (a) move my Lightroom catalogue and all associated assets to an external drive while (b) still backing up everything to Dropbox and Google Drive for safekeeping.
How would I go about doing that? I assume I'd start by de-syncing my Dropbox photo folder from my Macbook Air.