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Wow this is really clever. Would be cool to have an open source data migrator with the same concept

That thought was my first impression as well. However with a second thought i'm not sure if i'm convinced by the long time scenario that you would end up using this tool. After all it only makes sense to use this tool if you never intent to migrate the data completely. Which means, the data will till the end be scatered between AWS and Cloudflare with no apparent system other than the last access. Maybe I am overlooking something.

Nah. This is literally to have a migration path and to only occur once the Amazon eggres fees.

At the end, you can still decide to migrate all data or to abandon the not-used-till-now data.

Yes, it's free/very cheap to move S3 data to a tier like Infrequent Access or Glacier with lower monthly cost and higher retrieval cost.

"higher retrieval costs"

Getting that data is really high. It should only be used if you are sure it will never be accessed.

I've read quite a few posts where they complained about the huge bill, when they needed to get their data...

Not sure how it is right now, it's still obscure on their pricing page and before, you had to check the gotchas in their FAQ .

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