Also you could sync data to an API and offer a login function. If the cookie expires, login and download your data again. This could be end-to-end encrypted for

Also you could sync data to an API and offer a login function. If the cookie expires, login and download your data again. This could be end-to-end encrypted for privacy, and having remote storage enables other clients to login and access the same data. Either way it's wise to have some kind of persistence option beyond just cookies and localStorage. It's annoying how far Apple is behind Mozilla and Google when it comes to progressive web app functionality, but I don't think their action is as user-hostile as is being raised here.