ATIH and defrag

Should I only ever defrag a backup source HDD before a Full (in other words, never before Incrementals)? (With ATIH2017 I do not enable "Back up sector-by-sector".)
Should I never defrag the HDDs I dedicate 100% to storing backup images?
(The above was what I always did with Norton Ghost. And one reason I dedicate backup target drives 100% to that purpose.)


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Thank you very much for the great reply, Steve!
I will soon be using ATIH2018 on a Win7 system. I do realize that defrag is relatively unnecessary, and usually don't do it, I'm afraid that the one exception has been before Fulls since I know that after them I won't be able to (and I find it psychologically hard to resist doing something I soon won't be able to; I know this is irrational, perhaps I can get a grip on this compulsion from now on).
I guess Windows' maintenance defrag hasn't been a problem, since my system drive incrementals are small enough.
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