I tend to work on projects in my spare time that are small, self-contained web pages that do things like display a calendar, kanban board, web launcher, spreadsheet, document, log, world clock, etc. These are self-contained capsules of capability, containing both application logic and application data in a portable format that runs just about anywhere, and requires no special infrastructure (a simple WebDAV server is all that's needed). Since it is all file-based, the hosting, backup, restoration and duplication story is solved. I often wonder why these very simple applications are so rare; it may be because they are difficult to monetize. But since I don't care about that, but rather hackability and portability, I think they are pretty ideal.