First of all I will make some assumptions here, firstly you have your images stored inside Capture One sessions or the Lightroom equivalent and those are sitting on a local hard disk or USB drive that’s currently not being backed up.
Let’s get those images stored properly.
We need to get them moved onto a NAS (Network Attached Storage) device, they come in all shapes and sizes but to work out what is best for you I would look at how many images you have and times that space by 4. You should have a number say in this case it’s 4Tb of space needed, you will need to buy at least two discs depending on your storage technology that you choose.
Let’s choose a NAS drive, as I said, lots to choose from, the cheapest kind are normally 2 drive systems, which mirror one disk to the other known as RAID 0, these are super cheap and only involves two drives although you are limited in space to the single drive. The downside is the performance of read/write is limited to the drive you have and the cache, which are normally small for the RAID 0 drive units.
The best kind for performance are those that support RAID 5 which is best for write operations to the disk, with photography and image editing you will be doing lot’s of that. Performance is much improved over “mirrored” or RAID 0. RAID 5 requires at least three disks operate so your investment is much higher in both discs and the NAS drive to support it. RAID 6 is as good without the small read penalty that RAID 5 has but again needs more disk drives to work, increasing your dollar over heads further, however the pay off is speed.
What is the benefit of RAID 5 or RAID 6 ? Well if you lose a disk drive (it will happen at some point) the data is kept is safely working away on the other disks without much of a performance hit. All you have to do is replace the faulty disk, add it to the array and you’re back to shoot another day. With RAID 0 you can lose either drive but needs to be replaced quickly, and the performance will be much less.