I have an S3 bucked in the Asia Pacific (Sydney) region and have users from Australia using that bucket.
By far my largest charge is for AWS Data Transfer APS2-USE1-AWS-Out-Bytes Asia Pacific (Sydney) data transfer to US East (Northern Virginia).
However I do not have replication turned on for the Sydney bucket.
I do have some buckets in the US East (Northern Virginia) but I am not seeing any data being transferred to into them. So why am I being charged for the inter region transfers?