Just that
Maybe? It would depend on the duties imposed on a third party re the GDPR. If your host instance removes your data and a different instance doesn’t, do they have a duty to do so? Do you have to make the request of each instance with a copy?
Is the Wayback machine (https://archive.org/web/) required to remove content it’s archived to be compliant with GDPR?
Unknown, but they at least believe that they’re covered by an exception:
“As a library, the Internet Archive has, in the words of the GDPR, a “legitimate interest” in building collections, providing permanent public access, and maintaining archival integrity.”
Whether they’ve had that tested in court I do not know.