This app can run on all Windows 8 platforms(include the WinRT), what makes it unique is that it suuport WinRT. Now you can sync two folders on your WinRT device. The App supports three kinds of sync, include: Normal Sync, Mirror Sync and Two-way Sync. Normal Sync will sync everything in the Source Folder (includes subfolders and subfolders...) to the Destination Folder. If a file already exists in the Destination Folder, it will compare the sizes of the two files, if their sizes are different, it will copy the source file to the corresponding path with an unique name. Mirror Sync will finds all the folders and files that exist in the Destination Folder but not exist in the Source Folder, then delete them. Then it will execute Normal Sync( Except if a file already exists in the Destination Folder, it will be replaced). Making the Destination Folder the same with the Source Folder. Two-way Sync will sync everything in the Source Folder and Destination Folder to the Source Folder and Destination Folder. After the sync, either of these two folders will have everything you can find in the original Source Folder and the original Destination Folder. The app is also able to remember the settings of the last time sync. And it can save up to 10 folder pairs. You can try this app for 15 days.
The 4th release of this app. New UI, and fix the layout problem when screen resolution is not 1366 x 768. The app now can remember the Souce Folder Path and Destination Folder Path of the last time sync. Change the name Dual Sync to Two-way Sync. Add folder pair support. Now can save up to ten folder pairs.