I want to buy an external Hdd for backup and archives so that I can retrieve data whenever my internal drive fails and also additional storage as my present on is about to full. I will transfer all data to this one and keep it safe and then delete movies or other data from internal which I don't need on daily basis to free up space. I found canvio of toshiba to be cheap then seagate or wd but reviews are mixed . So which of these three are most durable and reliable for backup. safety of data is most important rather than additional software or other benefits. I will use usb 2.0