I didn’t lose anything other than Time Machine history. It wasn’t a huge deal since this Drobo served as a backup to my main Drobo. However, by the time I got home several days later a second 2TB Seagate drive had failed. While traveling on business I received an email alert that one of my drives had failed (an older 2TB Seagate). Although I had turned on Dual Redundancy on my Drobo 5D, I had not yet turned it on my Drobo 5N. As a matter of fact I now know this can happen. So if one fails (especially as they get older), then it’s likely that another one bought around the same time could fail shortly thereafter. When you setup your Drobo (RAID), chances are you bought multiple drives at the same time. I hear ya! However, before I tell you what happened on my other Drobo (5N), think about it. C’mon how likely is it that two drives would fail at the same time? With this feature enabled now two drives could fail at the same time and I’d still be protected. The last time I had a Seagate 3TB drive die in my Drobo 5N, I not only replaced it with a WD 4TB NAS drive, but I also enabled Drobo’s dual redundancy feature in the settings. The one thing we don’t really think about is what happens if two drives fail at the same time? Normally this means you’re screwed and it would be time to restore from a backup (after replacing the two failed drives). You’ll probably replace the failed drive with a larger one since larger drives come out every year. The whole reason to have a Drobo is so that if one of your hard drives fail your data will be protected and you can just keep working. ![]() In my home office I use a Drobo 5D connected to my Mac OS X Server as well as a second Drobo 5N to backup the Drobo 5D. ![]() I have several backups and offsite cloud backups too. Like you, my data is very important to me.
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