I use an external 1TB hard disk and Casper disk clone software. Casper creates a bootable, incremental clone of your hard drive. Every evening I hook up the external hard drive to the SATA-3 USB port on my laptop. Casper automatically starts up and updates the clone. This typically takes only 10 minutes, but will take longer if I have installed a big package or the defragger has decided that my internal drive needs attention.
Cost: US$130 for the 1TB external hard drive, Casper 8.0 US$50
True, you have only one backup version, but it is bootable and I used it to upgrade my 2@750GB (raid0) HDD to 2@1TB (raid1) SSHD. I just updated the external clone, removed the hard drives, installed the hybrid hard drives, changed the BIOS setting from raid0 to raid1, connected the external clone and booted. Then I ran Casper and had the clone copied to the internal drives. Then I booted up on the internal drives.