Embodiments are directed to locally storing a snapshot of a personal information management web application, efficiently booting a personal information management web application and to managing personal information management web application snapshots. In one scenario, a client computer system determines that various portions of stored content for a personal information management web application have been changed. The client computer system creates a snapshot of certain, specified portions of data that are used for booting the personal information management web application and stores the created snapshot in local storage on the client computer system. As such, the snapshot is available for the next personal information management web application boot-up.