This Forum Beta is ONLY for registered owners of D-Link products in the USA for which we have created boards at this time.
A backup of the data on the NAS is a REAL good idea, but I have not had to format when upgrading firmware versions yet.
I did not go to EXT3. I figured it would be somewhat slower with the additional writing required, and since the NAS units are 100% backup, I figure that I'd rather have the speed than the additional security of the journaling filesystem. My two NAS units get written a lot and read a little, so writing speeds are most important to me.