Built in? Nothing real easy that I can think of. I do however have personal experience with
HP Openview Storage Mirroring that works really well, and is very low bandwidth using. What it does is it sits at the kernel level and watches the filesystem traffic. Any activity to filesystems it is monitoring gets thrown into a queue to be distributed to the mirror. This can be done instantly, or at scheduled times.
The other issue I see with any software though is if it will install on Web Edition. I know the list is pretty short of software Microsoft allows to be installed, for licensing reasons. The above linked software will run on Web Edition, but make sure to check that on any other solutions you might look into.