Earlier quoted context omitted.
I think that's unlikely to be a thing they're working on. You can get that from storing your files in iCloud already, and these days is there any good reason to back up the rest of your system? If I had to rebuild a system due to hardware failure the absolute last thing I'd want to do would be restore all the accumulated system cruft!
That really depends on the user. As a developer, I’ve modified quite a few system files and would like those things backed up. It’s one reason I don’t use Backblaze – they refuse to backup system files. As an employer, I can imagine a situation in which those “cruft” files contain information about the actions of an employee that might be valuable in legal proceedings, or just providing they were terminated for cause…
I stopped doing that because I don't use new systems often enough to be worth it, and as someone else said it's also a good time to examine and improve your workflow.