I commute by train with my laptop - no internet access. I also work at shops where I can't use my laptop, but have internet access. I have a hosting account where I'll be hosting tracks for my family.

I'd like to have a local laptop copy of tracks, so I can work with it offline - and I'd like it to sync with the hosted account, when I get back online.

I'm figuring a rest based web service, where, when you push the sync button, it gets all changed tasks from the online site, inserts new, marks complete, and updates based on timestamps. Once the record sync was completed locally, it would put http the changes back to the host, including any new or updated tasks.