Important to note: for their anonymity, not yours.

Do you preserve archivers’ privacy? E.g. not disclose the source IP address?

Yes.

But take in mind that when you archive a page, your IP is being sent to the the website you archive as though you are using a proxy (in X-Forwarded-For header). This feature allows websites (e.g shops or the sites with weather forecast) target your region, not mine.

source: archive.today FAQ
(archive.today is the same as archive.is, they have a couple of alternate domains)