I've been using an external hosting service for my project management, however recently it became very unstable. I'm now willing to find another service however the major problem is migration. The service that I use now is TRAC-based. I need to be able to export my Git repository (this is easy) and my wiki pages (not so easy) to the new service that I'll choose. I haven't chosen the new service just yet - the import/export capability is one of the criteria. What would you recommend?