ReadyNAS NV+ V2

First, if your NV+ V2 is under warranty and there is a problem, Netgear will send you a replacement unless the problem is something like a lightning strike that destroys the unit. In that case, the best option is to replace the box with a refurbished one after going through the RMA process. Assuming the disks themselves are OK, then it can be as simple as putting the four disks into the new chassis (in the same order if possible) and simply turning on the new unit.

You also will have access to free technical support by phone for 90 days after purchase and free on-line technical support for the life of the warranty.

Please keep in mind that RAID is not a substitute for a back up of your data. It is a convenience, combining multiple drives into one large volume and allowing that volume to survive in the case of a single drive failure (dual drive failure in the case of 6 bay units with 4 or more drives and dual redundancy selected). I have a primary NAS and a secondary that backs up the primary every night. In addition, periodically I back up my critical/important data to a WD Passport and take to to my safety deposit box replacing it's twin which goes back up to be wiped and used for the next backup.

If this seems like a over the top solution, once you have encountered a total loss of all data on your hard drive (decades ago long before there was a desktop NAS). I have maintained a two deep backup ever since. I have a lot of music and videos that have been pulled from CDs and DVDs (which I still have) and while it would be inconvenient to back up all of that, I don't consider it critical or important like financial information and records and photographs.