title: AWS s3 sync to upload if file does not exist in target
body: <p>I have uploaded about 1,000,000 files from my local directory to s3 buckets/subfolders and some of them have failed.</p>
  
  <p>I would like to use the 'sync' option to capture those that did not make it the first time.  The s3 modified date is the date/time my file was uploaded (which differs from my source file date/times).</p>
  
  <p>As I understand, sync will upload a file to the target if it does not exist, if the file date has changed, or if the size is different.</p>
  
  <p>Can I modify the command line to NOT use the file date as a consideration for syncing? I ONLY want to copy a file if it does not exist.</p>
  
  <p>aws s3 sync \localserver\localshare\folder s3://mybucket/Folder1</p>