It's a more expensive investment to get started, (as opposed to something like CrashPlan, Carbonite, etc.) but I definitely recommend having a Drobo product hooked up to your network, with regularly scheduled backups to it.
If you got one of the five drive boxes, you could dump 5 2TB drives into it, and likely have enough capacity to store all 5TB of photos, and be able to flip on the option to have two drives crash simultaneously without you losing any data. (you definitely lose space using them, as I have a 1TB and 2TB in mine right now and only have ~900GB available) If you're using a mac, it can even act as a Time Capsule so you can direct Time Machine to back up directly to it. (my wife and I do this, it tends to back up about once a day rather than every hour like Apple promises) Yes, I know it's expensive, but it's nice to know I have a local box (nothing in the cloud!) with all my (and my wife's) data backed up to it, where if a hard drive decides to go kaput, neither of us lose anything.
Getting a "Drobo product" (NAS) won't do much when your house burns down or gets robbed. To be safe, you need your data to be in multiple physical locations.
That's fair enough. However, I do believe that the common case for data loss is that someone's hard drive dies, or you drop a laptop, or your laptop gets stolen, etc. Multiple physical locations provides the best safety, but there is value in having a local backup for when the hard drive dies in your computer.
Also I'm not sure what (NAS) means, and I apologize if I sound like a salesman or something. Wasn't sure how to best describe a line of products made by a company without sounding like one. I was just trying to recommend a solution that I, personally, own and use to cover a pretty common case. And also feeds my slight paranoia of having a lot of my personal data and whatnot on someone else's servers.
If you got one of the five drive boxes, you could dump 5 2TB drives into it, and likely have enough capacity to store all 5TB of photos, and be able to flip on the option to have two drives crash simultaneously without you losing any data. (you definitely lose space using them, as I have a 1TB and 2TB in mine right now and only have ~900GB available) If you're using a mac, it can even act as a Time Capsule so you can direct Time Machine to back up directly to it. (my wife and I do this, it tends to back up about once a day rather than every hour like Apple promises) Yes, I know it's expensive, but it's nice to know I have a local box (nothing in the cloud!) with all my (and my wife's) data backed up to it, where if a hard drive decides to go kaput, neither of us lose anything.