The Toshiba Canvio 3.0 has a version that costs $10 more, which includes software to perform backups. The user has the options of building file backups, full disk backups, or both. If using full-disk backups, it will be possible to boot directly from the USB drive into the disk-restoration utility. I typically see the full-disk backup as the quickest way to recover from a critical disk error.
Now, the Canvio line has many storage capacity options: 500GB/700GB/1TB/1.5TB, and the price for this new 1.5TB is $199.99 (with software) or $189.99 (without software).