Auto-backup installed packages

backup_packages.sh

#!/bin/bash
UPDATED="#Updated: $(date)"
PATH=/usr/local/bin:/usr/local/sbin:$PATH
echo $UPDATED > ~/Dropbox/home/python/requirements.txt
pip3 freeze >> ~/Dropbox/home/python/requirements.txt

echo $UPDATED > ~/Dropbox/home/homebrew/leaves.txt
brew leaves >> ~/Dropbox/home/homebrew/leaves.txt
echo $UPDATED > ~/Dropbox/home/homebrew/casks.txt
brew cask list >> ~/Dropbox/home/homebrew/casks.txt

net.stickystyle.launched.save_packages.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>net.stickystyle.launched.save_packages</string>
	<key>ProgramArguments</key>
	<array>
		<string>sh</string>
		<string>-c</string>
		<string>/Users/rparrish/Dropbox/home/backup_packages.sh</string>
	</array>
	<key>StandardErrorPath</key>
	<string>/tmp/net.stickystyle.launched.save_packages.err</string>
	<key>StandardOutPath</key>
	<string>/tmp/net.stickystyle.launched.save_packages.out</string>
	<key>StartCalendarInterval</key>
	<dict>
		<key>Hour</key>
		<integer>12</integer>
		<key>Minute</key>
		<integer>0</integer>
	</dict>
	<key>WatchPaths</key>
	<array>
    <string>/usr/local/lib/python3.6/site-packages</string>
		<string>/usr/local/Cellar</string>
		<string>/opt/homebrew-cask/Caskroom</string>
	</array>
</dict>
</plist>