Sony products are usually if high quality and sony one 1tb is also a good product.
It has a slim and cutting edge design and a great build quality. Its easy to use and transfer rate if data is also quite fast, I believe that in todays time you have to have an external device to back up your data and as your data is so important you shoukd only put your trust in the best.
Sony hard drive is good and reliable product to back up your data.