https://www.strato.com/en_us/c...
They are not exactly cheap, and max out at 5TB (at the moment, it will probably grow in the future). But you don't need a special client since the support e.g. rsync (even over SSH), SFTP or SCP. This means you can use standard tools. And they back up your storage separately (so you can restore older stuff if needed).
I use them since ten years or so, and never had any issues (my Synology NAS has a HiDrive app so it can sync with the cloud storage automatically).

see https://wiki.jenkins-ci.org/display/JENKINS/The+Continuous+Integration+Game+plugin
Continuous integration, together with a basic set of automated tests, ensures good quality all the times. And the game ensures that all participants want to get a good score :)
Maybe you can add some (very basic) static code analysis - just some rules where everybody agrees that they are essential for good code.