In my mind, it makes sense to have a backup drive with the same capacity of the original drive. I've done this for a few years with my PC.
When I ordered my new iMac, I got a 500 GB internal hard drive. Then I bought a couple Fantom 500 GB external hard drives.
Now I use SD to make a backup of my internal iMac drive to one of the Fantom 5600 GB external drives.
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