I haven't really searched very much for this information, but I'm hoping someone might now if it's possible to copy a backup manifest from an s3 bucket to another one.
In the past, the way to migrate VMs was to create a backup object in a shared backup location. When you make a backup in 1 location, the other Havester cluster picks it up in the next poll.
That makes it seem like you could also just copy all the files/bits over from one s3 bucket to another one.