Re: There was something newsworthy there
The Netapp's Snapshot feature created data snapshots that could be read by windows client's using the Shadow Copy functionality in Vista and later (i.e. the 'previous versions' tab), but were forced read-only by the filer head. To my knowledge, there was no way or setting those to read-write.
Not 100% certain on an actual windows file server using shadow copy- I've heard second- and third- hand rumors of malware and virii being able to trash shadow copies, but nothing first hand. (thankfully)
YMMV, obviously, check with the vendor of your storage appliance/system for official 'word of god' regarding features and capabilities, etc. etc. etc. :)