do I delete files on my computer after I back it up to send it in

653butt Said:

"do I delete files on my computer after I back it up to send it in"

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Performing Send-In Service?

If so, refer to the following...

Wait for the Box:

When you are sending it in for service, Apple will include a pamphlet with the end-in box, informing you what to do. You'll get the send-in box in the mail. They will be pre-paid label included.

If you are asking about trade in you do this: What to do before you sell, give away, or trade in your Mac - Apple Support

I was going to take my old Mac in for a new battery and there was absolutely no mention of deleting anything.