Is there a U3 version of SyncBack?

Support for U3 was dropped in V6 (as the U3 standard itself has been discontinued by its creators). However, there is a V5 version that can be used with U3. The U3 version of SyncBackPro V5 is available for download here:

http://www.2brightsparks.com/assets/software/SyncBackProV5.u3p

The U3 version of SyncBackSE V5 is available for download here:

http://www.2brightsparks.com/assets/software/SyncBackSEV5.u3p

There is no U3 version of SyncBackLite or Free.  

Important: The U3 versions of SyncBackSE and SyncBackPro have not been officially certified and are not supported.