The shadow copy provider timed out while flushing data to the volume being shadow copied. This is probably due to excessive activity on the volume. Try again later when the volume is not being used so heavily.
My backups act horrible. It will sit for 20 minutes, locking up the machine attempting to do a shadow copy. When I look at the event logs, it is loaded with the error: > Volume Shadow Copy Service error: The I/O writes cannot be flushed during the > shadow copy [...] read more