And the solution to getting it synced is to back up your computer, which you should definitely be doing.
More broadly, though, I don't know that I consider whole-system backups as important as I might have once. All my local important docs are in Dropbox, and all the code I'm working on is regularly synced out to git hosts. Other than some unimportant Fusion/Bambu projects, most of what I'd lose is honestly that same kind of ephemeral context that unsaved Notepad++ files are: terminal history, browser bar completions, my downloads folder, etc.