I guess it's because this kind of backup doesn't mitigate an ongoing compromise of your machine (much like what the GP talked about). I don't think any backup c

I guess it's because this kind of backup doesn't mitigate an ongoing compromise of your machine (much like what the GP talked about). I don't think any backup can protect for that. However a good backup limits the damage to the timeframe of the machine being compromised (if your machine is compromised for 1 day you might only lose that day's new data).