With regards to moving data from an on-prem Ceph to AWS, the following are some considerations:
(1) Which version / release of Ceph is this?
(2) Are you trying to move data from rbd, rgw, and cephfs or just rgw?
(3) You can certainly use DataSync to transfer data from rgw but having a reasonably decent connection to move 70 TB would be required if you have a timeline that needs to be met.
(4) You can use Snowball Edge to transfer data from Ceph onto Snowball for the bulk migration, but it will not be able to retain the metadata if you use S3 for the data transfer (you can retain POSIX metadata if you use the File Interface/NFS though that will be quite a lot slower than using the S3 endpoint); with this method, you can use DataSync after the data has been imported into S3 to synchronize the metadata and any updates. Note: S3 on Snowball Edge supports a subset of the S3 API/CLI, so this would need to be tested.
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