This has become to me like the black box recorder has become to the areo industry.
I purchased this item as my PC began to run quite sluggishly as I had nearly filled the hard drive, The size of this external hard drive being 1TB meant that I could fit around 320,000 high resolution digital photos which is more than I think I'll take in a life time but it's also fantastic for backing up all my documents, videos and also my music.
I recently had a computer that crashed completely and had I not backed up all my important documents and photo's on this little portable hard drive, they would be gone forever. Thankfully I had a neat filing system on my drive and I could copy everything I needed onto my new computer!

This little device has saved me from losing all of my work and personal photos and has also allowed me to transfer files from computer to computer which is important when working from home and the office and is much more trust-worthy and robust than a pen drive.

I would say if you don't want to lose any of your documents, music or photos then buy this and back it all up!