Go into your Neverwinter/Live/Data/ns folder and back it up. That *appears* to have one folder for every quest you author and appears to save a snapshot of them when you last edited them. It can't hurt.
Harper Chronicles: Cap Snatchers (RELEASED) - NW-DPUTABC6X
Blood Magic (RELEASED) - NW-DUU2P7HCO
Children of the Fey (RELEASED) - NW-DKSSAPFPF
Buried Under Blacklake (WIP) - NW-DEDV2PAEP
The Redcap Rebels (WIP) - NW-DO23AFHFH