Thanks for reaching out to the Community with your question. Your concerns are valid, and I can assure you that your reporting will not change if you move/delete contacts. You will always be able to go back and see who each campaign was sent to, opens, clicks, etc.
You may want to consider taking a look at your bounce reports, and removing bad email addresses directly from the report so you also have the option to unsubscribe them. If you do this, the bounce report will still be there, but the email addresses you removed will have a line drawn through them to show that they have been managed. This only happens on bounce reports.
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