Nice to have a robocopy tool with shadowcopy functionality! I miss one feature: 2-way Synchronisation, like SyncToy's "Synchronization".
Without shadowcopy it can be done with these robocopy commands:
robocopy "c:\local" "\\server\target" /e /xo /r:10 /W:1 /np /eta
robocopy \\server\target "c:\local" /e /xo /r:10 /W:1 /np /eta
Thanks for the suggestion, it's incorporated now in v1.1!