launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist # start the PostgreSQL server

	to back up the local machine's hard drive:

		turn on and connect the 2 TB external hard drive

		l=1 overwrite=1 src=/ dest=/Volumes/Macintosh\ HD\ backup/ sudo -E put --exclude=/.fseventsd/ --exclude=/private/var/vm/ --exclude=/usr/local/var/postgres/ --exclude=/Users/aaronmk/.dropbox/

			# no --extended-attributes: rsync has to visit every file for this

			# runtime: 10 min (~600); initial runtime: 4-13 h ("2422.84"+"12379.91" .. "45813.19"+"747.96")

		stop Dropbox: system tray > Dropbox icon > gear icon > Quit Dropbox

			otherwise, the backup of ~/.dropbox will be corrupted

		launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist # stop the PostgreSQL server

		l=1 overwrite=1 src=/ dest=/Volumes/Macintosh\ HD\ backup/ sudo -E put --exclude=/.fseventsd/ --exclude=/private/var/vm/

		launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist # start the PostgreSQL server

		start Dropbox: /Applications > double-click Dropbox.app