Everyone,
I’ve suffered too much from the WD Sharespace running RAID5, it failed on my almost once every 2 months and required a rebuild or a very time consuming recovery. I now use Disk Striping and have not had an issue for almost a year now. My issue was that a power cut would immediately break the raid5 and then an automatic rebuild of the drive would occur, taking almost a day. In the case of disk striping, I assume that there is no inconsistency when the data is written and the power interrupted, so it just continues from there.
The proabability of a power cycle is much higher than the probability of a drive failure for me at least.
I still backup to another media just in case.