Pro pioneer 2TB -> 3TB disks

Partly true,
If RAID6 is not not a suitable backup then tell us what is? Tape doesn't last forever(but at least it only loses linear data), spare HDD still have the issue of how often are they replicated, if they are all stored on site then lets hope the site doesn't get burned down or the data storage devices stolen. If you want to Rsync then you still need another site with hardware that can fail and most of all....
Try getting old parts for the early readynas that were made like mine or any old tape storage device. The best solution is to be constantly upgrading your backup solution, whatever that may be.

I was burned mostly by ReadyNAS listing on the HCL hardware that was not compatible which has since been removed. I have not lost my data but I have lost weeks of my time restoring data from HDD manually in a custom built RAID array, not to mention the thousands of dollars in HDD's.

Oh BTW Gold DVD's are supposed to be doing really well if all you want is precious family photos.

MrCyberdude wrote:
...If RAID6 is not not a suitable backup then tell us what is?...

I said RAID-6 is not a substitute for backup which is different from saying that a RAID-6 array is not suitable for backup. I'd never trust my data to a single device, even if it is running RAID-6.

I back up my Pro-6 (which uses RAID-5) to my older NV+ and Duo NAS. I also back it up to the cloud using Crashplan, which provides off-site protection against fire,theft,etc. For many years now my strategy has been to have at least 3 copies of everything. The media has changed over the years (rewritable DVD, USB hard drives, and now NAS+cloud). So far I haven't lost any data since I started using that strategy.

PapaBear similarly backs up his NAS to a second NAS, and rotates a USB drive off-site for his critical data.