You are a PC or a laptop user and you want your data to have a offline backup and you really want the cheapest right?
Well you have come to the right place!
You Need A HDD : For starters, the place where you live must be having second hand or used devices store, you can look them online. (don’t buy online because you can’t check the HDD they are selling you) (go to the store check HDD health and buy it).
And you can easily get a 2.5 inch HDD, near a laptop repair store, it will be half the price and HDD will work as new. (as there are a lot of laptop that are broken, and they buy broken laptop and sell the parts).
Next you need a USB to Sata adapter for HDD to connect you hdd to computer. (remember to check for 2.5 inch or 3.5 inch drive).
That’s all, and now you saved 50-80% of your money and you have a good offline backup device.