[CristinaEvelinRoberts]

Some sync services may not fully support projects and checklists. Currently the only two sync services that fully support projects and preserve their relationship with the subtasks are:

* Appigo Sync
* Toodledo Pro Account

If you choose not to sync with one of these options, you will still be able to use projects and checklists in Todo. However, your sync service may not display or sync them properly as projects.

An additional benefit of using one of the sync services named above comes in if you ever have to reset Todo's tasks. When you synchronize a fresh copy of your tasks from the sync service, the project and subtasks relationships will all be preserved if you use one of the supported sync services. Otherwise, subtasks will synchronize back as standard tasks.