I've experimented, and it's not due to encryption, so I presume it is
related to multipart during the AWS backup or restore process.
e.g. original bucket, with mountable s3ql:
object ncs3ql_data_1 has ETag 6af237cd6aa167ec276eb58f9f9a52c6
Same object on restored bucket: ETag dc3d145a13fa955d024aaa4165826530-1
If I download the file from the restored bucket, and run md5 on it, I
get back the original ETag, so it is the same data.
If I try fsck on the restored bucket, it's v not happy:
WARNING: MD5 mismatch for s3ql_passphrase:
b428f7203f2bfd8b547be1ade86a74a3-1 vs 0c8d069f75210a79332014f7cb38454a
WARNING: MD5 mismatch for s3ql_passphrase:
b428f7203f2bfd8b547be1ade86a74a3-1 vs 0c8d069f75210a79332014f7cb38454a
WARNING: MD5 mismatch for s3ql_passphrase:
b428f7203f2bfd8b547be1ade86a74a3-1 vs 0c8d069f75210a79332014f7cb38454a
Encountered BadDigestError (BadDigest: ETag header does not agree with
calculated MD5), retrying Backend.perform_read (attempt 3)...
WARNING: MD5 mismatch for s3ql_passphrase:
b428f7203f2bfd8b547be1ade86a74a3-1 vs 0c8d069f75210a79332014f7cb38454a
Encountered BadDigestError (BadDigest: ETag header does not agree with
calculated MD5), retrying Backend.perform_read (attempt 4)...
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