how to achieve long time offline capabilities on mobile/tab for the VBCS application.

Summary: As part of the requirement , the customer wants to have an online and offline capabilities. As per the customer the application would be running on a tablet as well as a local laptop where the customer may or may not have internet connection. When asked about duration , they mentioned it could be days they won't have internet.

Can i leverage VBCS as PWA application on the tablet/mobile along with any database like SQL lite to store data on the mobile device and create a method to sync it back to cloud or to the server when the internet is available. Caching will not help as it will not hold a lot of data and will also make the tablet slow.