A quick guide to backing up on Amazon S3 Ensure you have the AWS command-line utilities downloaded:

# sudo yum install python-pip 
# sudo pip install awscli

Configure your credentials

# aws configure

Create your S3 bucket

Create an IAM user

Attach a User Policy granting access to your S3 Bucket

{
   "Statement" : [
      {
         "Action" : [
            "s3:*"
         ],
         "Effect" : "Allow",
         "Resource" : [
            "arn:aws:s3:::YourBucketName",
            "arn:aws:s3:::YourBucketName/*"
         ],
         "Sid" : "Stmt1423022883000"
      }
   ],
   "Version" : "2012-10-17"
}

Attach another User Policy granting access to list all buckets:

{
   "Statement" : [
      {
         "Action" : "s3:ListAllMyBuckets",
         "Effect" : "Allow",
         "Resource" : "arn:aws:s3:::*"
      }
   ]
}

For added protection, you can enable SSE (Server-Side Encryption with Amazon S3). Go to your bucket in the AWS console, then under Properties->Permissions->Edit Bucket Policy, add the following policy:

{
   "Id" : "PutObjPolicy",
   "Statement" : [
      {
         "Action" : "s3:PutObject",
         "Condition" : {
            "StringNotEquals" : {
               "s3:x-amz-server-side-encryption" : "AES256"
            }
         },
         "Effect" : "Deny",
         "Principal" : "*",
         "Resource" : "arn:aws:s3:::YourBucketName/*",
         "Sid" : "DenyUnEncryptedObjectUploads"
      }
   ],
   "Version" : "2012-10-17"
}

Now Sync

# aws s3 sync /my/local/directory s3://YourBucketName/

Or sync with SSE

# aws s3 sync --sse /my/local/directory s3://YourBucketName/