It takes 3 and a half hours to simply list all of the files is the wasabi S3 bucket. Fark. Ok. I'm going to do a sneaky 3 stage migration 1. Migrate 99.999% of the files (Primary Sync) 2. Move to the new bucket 3. Complete a second sync that should only move files created created between step 1 and step 2). It means that a handful of new files will be broken for about 5 hours... but nothing will be lost