For a while now Amazon has been offering a free micro configuration of Ubuntu on S3. This is a great opportunity to set up a simple development and test environment, for example for WordPress or a Web Site. Using s3cmd you can then back up your server to S3.
I struggled for a couple of days setting up a vsftpd server on an Amazon EC2 Server running Ubuntu 12.04 LTS and in principal the setup is relatively easy. However, recent security updates which seem impossible to fix unless you recompile the source code and adding this to your vsftpd configuration file kept me struggling for a few days