I got this from hohle, but the formatting on Jon’s post is less-than-ideal. So here it is, reposted for easy copy/paste:
Download his applescript here.
And here’s the 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>Disabled</key>
<false/>
<key>Label</key>
<string>local.isync.sync</string>
<key>LowPriorityIO</key>
<true/>
<key>Nice</key>
<integer>1</integer>
<key>ProgramArguments</key>
<array>
<string>osascript</string>
<string>
/Users/schapht/Library/Scripts/AutoSync.scpt
</string>
</array>
<key>StandardErrorPath</key>
<string>/dev/null</string>
<key>StandardOutPath</key>
<string>/dev/null</string>
<key>StartInterval</key>
<integer>1800</integer>
</dict>
</plist>
Just make sure to change your plist to point to wherever you keep AuthSync.scpt. Then save it to ~/Library/LaunchAgents/local.isync.sync.plist
and run the following from your Terminal:
launchctl load ~/Library/LaunchAgents/local.isync.sync.plist
launchctl start local.isync.sync