AWS S3 Backups - User Cron - Should I create a backup User?

[techlists at phpcoderusa.com]

Hi,

I have been using the AWS S3 PHP SDK to backup my web content for maybe 
12 years.  I'm revisiting it.

I'm thinking that it might be more secure to create a backup user for 
just this process.  The credentials would be stored in the backup user's 
home directory, the script would be owned by the backup user, and the 
cron would be that backup user's cron.

Am I on the right path and is there something else I should be looking 
at?

Thanks!!
Keith