How do I encrypt and existing iTunes backup?

Is there any way to encrypt a backup besides making a whole new encrypted one in iTunes?

Ouch. This is (potentially) a Big Question.
The short answer is, look at the Java Cryptography Extension (JCE) API. It'll do all the en/decryption you could ever want.
However, that isn't really what you need to think about (yet). If you encrypt the password, you'll need a key. Who gets to "know" that key? And how do they get it? And (most importantly) how do you keep "the bad guys" from knowing that key? In fact - who are "the bad guys" in your scenario?
Before anybody here can help, you really need to be able to explain all of these. Otherwise, we can throw algorithms and APIs at you all day, and not get you any closer to solving your problem...
Grant

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But how do I create a new iTunes backup password without knowing the previous one?

In case anyone keeps track of such things, I'm among those folks who really doesn't recall ever being asked to create an iTunes backup password, but that's irrelevant to my question.
I'm not in any bind. I don't need my backup files to restore anything. I will shed no tears as they are moved to the Recycle Bin (indeed, I will gladly do the deed myself).
That said, it appears impossible to create a new backup password without knowing the previous one.
If the only "solution" is to wipe my iPhone's memory and start from scratch, I will be a sad camper.
Any help? Are backups to iCloud encrypted?
Cheers...

Additionally:
Be super critical & meticulous (and whatever other synonym I missed) when you get a new password:
Write it onto your bedroom wall, or someplace off of a computer that you will always find.
If you active 2-step verification, the key is VERY important. Lose it & you may be toast.
If you don’t 2 step verify, & use the Security Question instead --> do not lose, or forget the answers.
Very nearly the same outcome!!!!!: Bad experience.
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How do I encrypt and existing iTunes backup?

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