Let's take a look at my backup script, which only has four commands:

try
	
	tell application "Finder"
		try
			-- put in it's own try block because it'll error
			-- out if it can't find volume. We still want some
			-- file backups to occur.
			mount volume Â
				"afp://jennifer.tgd-inc.com/jennifer_data" as user name Â
				"Kevin C. Wong" with password "xxxxxx"
		end try
		
		-- open "File Synchronization" control panel. This will
		-- start file backups. Once done they start again after
		-- one minute, so we want to give it some time to do
		-- backups but kill it so it doesn't constantly use
		-- AppleShare.
		open file "ATA_00:System Folder:Control Panels:File Synchronization"
		delay 900
	end tell
	
	tell application "File Synchronization"
		quit
	end tell
	
end try

First of all, it's in a big try...end try block so that if there is an error the script will just quit. Basically, if there is an error in a try block, the script jumps to the error handling routines right after the try block, if no routines exist then the script just continues after the try block. This is the same reason why the mount volume command is in its own try block: if there is an error, I still want the File Sync to take place so that some files are backed up (just not to the network drive).

Hopefully the mount volume command is easy to figure out. In my script it uses AppleShare to mount the jennifer_data volume of jennifer.tgd-inc.com. Naturally that's not my actual password. With Apple's iDisk you should be able to mount your folder with "afp://idisk.apple.com/<username>" as the mount volume, although I haven't tried it.

The open file command tells the Finder to Open the file. Usually you can also {tell application "<application name>"; launch} to start an application, but that doesn't seem to work with File Synchronization so I use the Finder. Once File Sync is started the script waits 900 seconds, or fifteen minutes.

There are no Finder commands to quit an application, so you have to tell the application to quit itself. That's what the {tell application "File Sync.."} block does. No matter where it is in the File Sync process, the control panel will quit, although perhaps generating an error. The error is no problem in OS 9 since Finder errors aren't model any longer; but it could stop your Mac if you use an earlier OS, so I recommend OkeyDokeyPro which automatically hits RETURN in modal dialog boxes.