S3 moving files between buckets on different accounts?

Bandwidth inside AWS does not count, so you could save some money and time by doing it all from a box inside AWS, as long as the buckets are in the same region.

As for doing it without having the file touch down on a computer somewhere - don't think so.

Except:Since they do bulk uploads from hard drives you mail to them, they might do the same for you for a bucket to bucket transfer.

You don't have to open permissions to everyone. Use the below Bucket policies on source and destination for copying from a bucket in one account to another using an IAM user

• Bucket to Copy from: SourceBucket

• Bucket to Copy to: DestinationBucket

• Source AWS Account ID: XXXX–XXXX-XXXX

• Source IAM User: src–iam-user

The below policy means – the IAM user - XXXX–XXXX-XXXX:src–iam-user has s3:ListBucket and s3:GetObject privileges on SourceBucket/* and s3:ListBucket and s3:PutObject privileges on DestinationBucket/*

On the SourceBucket the policy should be like:

{
  "Id": "Policy1357935677554",
  "Statement": [{
    "Sid": "Stmt1357935647218",
    "Action": ["s3:ListBucket"],
    "Effect": "Allow",
    "Resource": "arn:aws:s3:::SourceBucket",
    "Principal": {"AWS": "arn:aws:iam::XXXXXXXXXXXX:user/src–iam-user"}
  }, {
    "Sid": "Stmt1357935676138",
    "Action": ["s3:GetObject"],
    "Effect": "Allow",
    "Resource": "arn:aws:s3:::SourceBucket/*",
    "Principal": {"AWS": "arn:aws:iam::XXXXXXXXXXXX:user/src–iam-user"}
  }]
}

On the DestinationBucket the policy should be:

{
  "Id": "Policy1357935677555",
  "Statement": [{
    "Sid": "Stmt1357935647218",
    "Action": ["s3:ListBucket"],
    "Effect": "Allow",
    "Resource": "arn:aws:s3:::DestinationBucket",
    "Principal": {"AWS": "arn:aws:iam::XXXXXXXXXXXX:user/src–iam-user"}
  }, {
    "Sid": "Stmt1357935676138",
    "Action": ["s3:PutObject"],
    "Effect": "Allow",
    "Resource": "arn:aws:s3:::DestinationBucket/*",
    "Principal": {"AWS": "arn:aws:iam::XXXXXXXXXXXX:user/src–iam-user"}
  }]
}

Command to be run is s3cmd cp s3://SourceBucket/File1 s3://DestinationBucket/File1