Multi tenant SaaS - separate databases + local database

I'm developing specific Multi tenant cloud application. Each tenant will have separate database. This application will running on local network and in cloud together. Tenant can store data, if is internet connection closed. Local tenant database and cloud tenant database must be synchronized (tenant can store data in localDB or in cloud database concurrently). This was most important point for decision of using separate databases for each tenant. I will resolve tenant conection string base on url. Please see my basic schema of functionality and tell me if is this good solution?