AOL offers XDrive for up to 5GB of free storage. I’d like to use this to back up my hosted web service, but I would need a way to do this via PHP or a Linux command line tool. Right now that does not seem possible. But these Python scripts are promising. Check back and look for other options as well. Right now S3 looks expensive and Gmail also has no command-line tools. Maybe a second low-price account with a vendor who offers SSH access would be the way to go?