Because you’re responsible for your own data.

It’s no one else’s job unless you pay them, which is you taking a backup.

And when I say “a backup” I mean multiple backups different media different locations, different backup mechanisms depending on how much you really don’t want to lose the data.

You seem to have misunderstood what is going on here.

The data here is Google's data. They sell ads to political parties. They then make details of those ad sales available to researchers to let them understand how political ad spending is happening in different countries.

This researcher is complaining that Google appear to have changed their mind about making that data available.

A very good backup has regular restore tests and the 3-2-1 system. An awesome backup has very regular restore tests and the 3-2-1-1 system.

Don’t forget the backup system that backs up the AWS data to AWS using AWS backup systems that’s also a good approach.

Or the decision not to backup your source code because “it’s on GitHub”. That’s also a ripper backup approach.

That seems like an extremely poor approach. What if someone at Amazon accidentally deletes your account?

> Why can't it be the fault of both parties?

It can be, but it isn't in this case.