In Mountain Lion you can back up to more than Time Machine drive. Go to System Preferences, Time Machine, and set a new drive. You will be able to use the new one in addition to the existing one. If both are connected, backups alternate between each. If only one is connected, it uses that every hour. This way you can have a Time Machine backup for your MacBook at work and at home.
Multiple Time Machine Backups
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So, could you simultaneously use Dolly Drive and an EDH with Time Machine?
I'd ask the folks at Dolly Drive (online backup via Time Machine) and see what they say. The answer should be yes, but there might be more to it.