FreeFileSync
If you are looking for a free synchronization program with unrestricted smartsync needs, then FreeFilesync is a great alternative. Actually, this is not a real backup program, but a synchronization tool like SyncToy. FreeFile Sync uses the Windows task scheduler to schedule synchronization, but also contains a so-called real sync feature, which enables synchronize to take place when an USB stick is connected. FreeFileSync has a myriad of options for syncing files between two folders and locations. The user interface is especially user friendly and makes it easy to quickly adjust your settings. Be carefull not to click the wrong downloadlink.