A possible way to perform something similar to a sync using iDisk or some other storage is to create two Automator actions.
1) Quit Journler Automator Application This workflow has three actions
a) Quit Application – Journler
b) Get Selected Finder Items – select your Journler folder
c) Copy Finder Items – in the to box, select the place on your iDisk or USB stick where you would like to store your Journler folder. Make sure you select “Replace existing files”
Save this as an application. Drop it in the ~/Library/Scripts/Journler folder.
2) Launch Journler Automator Application This workflow has three actions
a) Get Selected Finder Items – Select the Journler folder on your iDisk or USB stick.
b) Copy Finder Items – in the to box, select the containing folder of your original Journler folder (you are overwriting the whole Journler folder).
c) Launch Application – Journler, Save this as an application and put it in your Dock in place of the original Journler Icon.
How this works: When you are quitting Journler and you want to send your files to the sync location (iDisk or USB Stick) instead of Cmd-Q or Journler -> Quit, you select the Scripts menu and then the Quit Journler application that you just created. This application copies the whole Journler file to your sync location.
Then when you Launch Journler, you use the newly created application that first copies the the updated Journler folder from your sync location to your default location. Then it launches Journler and you have all of your updated files.
For me its a little easier than having to remember to drag over the folder. I also dress up my Launch Journler action with the Journler icon so it looks nice in the Dock.