We just published an open-source command-line utility for restoring your Arq backups.
It’s on github: http://sreitshamer.github.com/arq_restore/
It’s very simple to use. Just type “arq_restore” to list the backed-up folders, and “arq_restore <path>” to restore from a backed-up folder. arq_restore restores from the latest backup of the folder.
Our point of view is that your backups should be controlled by you, not by some “online backup provider”. Anything else doesn’t “feel” like backup.
This command-line utility is a key part of giving you full control of your backups. You control your backup data (it’s in your own S3 account) and you have the means to easily restore from it in the future without depending on Haystack Software.