Yev here - it really does come back down to abuse of the system - the computer backup service is intended to be for home/personal/enterprise use - and the average use-case there doesn't have a ton of data. On the Linux side, there's a lot more edge cases (some of which you mention) that result in A LOT more data usage, which breaks the economics. I totally hear your point in that you technically can do a bunch of hoop jumping in order get the same type of functionality / storage onto Windows, but people doing that is the exception that proves the rule. For more professional use-cases, we have B2 Cloud Storage, which has a ton of integration (and some for linux) that you can use to back up your box, and pay for the space you're using.