If you back up your Mac to Amazon S3, you may be familiar with Arq online backup for Mac. Arq (US$29) enables you to store your data to your personal Amazon Web Services account.
All charges incurred stay between you and S3; Haystack Software never sees your data or your billing. The backups use an open documented format with encryption that you control. You can even grab individual files from your backups on-the-go using the free iOS client.
Amazon Glacier
Now, Arq has added support for
