Native To-do create and edit screens keep a short structured recovery copy in the device's protected store, scoped to the signed-in account, workspace and To-do. The copy is removed after a successful save or delete. Large drafts remain editable but are not persisted, and this feature does not create an offline save queue.
Keep short To-do drafts on the mobile device
The mobile app keeps a bounded recovery copy while you create or edit a To-do.