Task Scheduler : Window can’t find the specified folder

I don't think the task scheduler GUI gives any way to run an interactive task. But the AT command does appear to. I found this article on technet that describes (among other things) the /interactive switch for the AT command.

One of the gotchas of scheduled tasks is, that tasks can run as different users - essentially in their own session. They are usually not desktop-interactive processes. You can make this happen by making the task run only if the user is logged in. Another thing is that maybe you could create a batch task that starts the other batch files, there are different commands that allow you to specify how a batch file or executable runs. "start" is one that provides a bunch of options, "call" is another - for batch files specifically.

Another option is to try Yintersync (yinter.net), free, for Windows, works with rsync, is very stable, supports shadow copies. It was the only working solution I could find that was both stable and fast enough.