I think it depends on the reason why.
Does the story needs retelling because what's already there doesn't work for what you want to do now? Then yes.
Are you dissatisfied with how it looks?
If it's deferring new readers, then yes. (I redrew the first 20 pages for my webcomic when it was published.)
But if it's okayish: leave it be. It's unavoidable for long running webcomics: you evolve, you learn, you grow. Reiterating what's there, is time you could put in making more story.
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