You raise a good point there about partitions.

Some users might have a C: and a D: drive, which appear for all intents and purposes like 2 different physical drives, when in reality they are the one physical drive with two partitions.

If this is the user's setup, then backing up from C: to D: certainly doesn't obviate the risk.

And if a user's laptop has such a configuration it's very likely to be the one physical disk. Not many laptops have two drives.

Removable and offsite storage tends to provide the best protection.

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