Look into using the AmazonS3 module which uses the official Amazon SDK which has a drush make script and uses libraries to load it which is much cleaner and easy to deal with.

http://drupal.org/project/amazons3

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couturier CreditAttribution: couturier as a volunteer commented
Issue summary: View changes
Status: Active » Closed (outdated)

The 7.x-2.x branch will be deprecated soon. See this issue: Verify 7.x-2.x -to- 7.x-3.x upgrade path, mark 7.x-2.x as unsupported.

This issue is very old, and many other users have reported successfully using Backup and Migrate with AmazonS3 since this was filed.