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Lovely #fediverse operators / #fediadmin, can someone point me to best practices when it comes to spinning up test instances that are designed to be deleted after some time?

It is unclear to me what happens in #ActivityPub when a server that was known disappears. I know this has happened in the past in rather traumatic ways (instance gone, backups gone, ...), so it must be somewhat well-supported.

Given that this is planned and designed though, I'd like to do things "properly" :-).