[ygra]

File History in Windows 8 is nice, sort of. It takes snapshots of changed files every hour. Sadly you have to enable it first and it's sort-of treated as a backup (so you have to store the copies on a different volume, etc.). So, not exactly what people have in their home unless they know about such things.

[grey-area]

I think the missing solution here though is collaboration and versioning between people, rather than individual backups.

Things like File History and Time Machine are nice, but don't really address this need.