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when rclone uploads a file, it saves the md5 as metadata. that is what rclone uses with rclone check

ETag is used a few ways.

  1. for each chunk of a file, uploaded or downloaded, rclone calculates the ETag and compares it to ETag in the s3 response header
  2. for file upload. after the entire file is uploaded, rclone compares the ETag for the source file to the ETag in the s3 response header.

for the deep dive about ETag, check out my topics