I just logged in and found that I have no projects saved. Where did they go and how do I get them back?

This is because the 300 days has passed AFTER you last subscription.
www.j-cook.pro/index.php/terms-of-service (1.7)

This is for cleaning all the obselete projects such as tests

I do not delete the projects, so I can reactive them. Normaly it is not a legal obligation for me to restitute your project so the condition can varies.
At the moment, I simply ask you a minimum subscription of 3 months.

Once done, I will import all you old projects again.