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#21
So long as you're using USB3 it really doesn't matter all that much. IF you are using imaging routinely, you will already have a backup disk you are using.
In my case, I use a 2Tb HDD. The definition file created when I first made the initial image which defines the backup task is what I then use to create a differential image periodically. Doing that for the O/S, data and installed programs takes perhaps 8-13 mins.
A full image less than 20 mins.
Just an example... depends how much used data space you have on C: