I've been using a Drobo5N2 for about 4 years now. Well there was a gap in the middle. The drive held my ripped collection of DVD's that I could watch on Plex and some backups. The gap came from an issue after a firmware upgrade. I couldn't mount the drives anymore. The unit was out of warranty, so I tried several steps on my own and could not get it to recover. It sat for over a year mocking me. I don't remember everything I did to try and recover, but near the end I know I pulled drives trying to get it to rebuild, which it did, but still would not mount. When I got back to it I did another firmware upgrade, still no love. So I decided I would pay for a support call. Turns out they never charged me nor even ask for a credit card. One of my drives may have caused an initial problem that was exacerbated when the firmware update rebooted the box. I didn't see anything in the later firmware notes, but I assume there was something that was fixed later. Drobo support was able to point me to some publicly available tools to get things working again. The support was done over their support messaging system. It took a couple of days of back and forth, but was very helpful and ended in success. My point to all of this is that I expected to have to start over with an empty Drobo. But even with all of the drive pulling I did when I figured I didn't have anything to lose, the system maintained integrity. I didn't loose any data.