I think modern web apps alleviate a lot of these issues if done right. They can function without internet since they can contain and persist a local version of

I think modern web apps alleviate a lot of these issues if done right. They can function without internet since they can contain and persist a local version of the required data. Oftentimes you can save it locally and _eventually_ sync with the server. Legally, at least in the EU, you can request at least all personally identifiable information in a standard compliant or easily readable format. API based clients also theoretically allow for easy fetching of data, which you can then in turn persist in any way you like. Still, for the average user, most of the times you are at the mercy of the SaaS provider. I think a legal requirement for standard-compliant data export would be nice.