For somewhere like the NHS the data shouldn't be stored locally, so dealing with ransomware like that should just be a reinstallation process.
If data is held locally and not backed up, this is going to be a painful lesson.
Of course, IT systems/processes at big companies (and places like the NHS) are woeful.
The big problem for them right now (like you say, I would hope the critical/sensitive data is not just scattered across a windows desktop) will be that any affected machines will be out of action.
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For somewhere like the NHS the data shouldn't be stored locally, so dealing with ransomware like that should just be a reinstallation process.
If data is held locally and not backed up, this is going to be a painful lesson.
Of course, IT systems/processes at big companies (and places like the NHS) are woeful.