Nowadays I started to use a new online versioning service provider: Projectlocker. It seems to be a good one, I hope it will be reliable. I’m using the free version, which gives 5 users and 0.5 GB of storage, but if I need more space or more contributors, it can be upgraded to 30 users and 30 GB storage. It provides SVN and Trac. Try it! If you know better service, please post a comment!