I am on holiday at the moment. We have spent $0 on AWS for the last 6 months. We use AWS for backups and distributed storage. I believe we have over 70TB stored.
Yes, we do have future plans to host the planet data on AWS. The expected cost is $0/month due to our hosting for this being under AWS public data program.
I can give a more extensive response once I am back from holiday later this week.