*shrugs*... I keep it plugged in all the time... And I keep it on all the time (just in the sleepy mode)...
Although I hear where you're not going to use it for long periods of time (say a couple weeks or more, like if you go on a long vacation or something) it's best to turn it off by the switch on the back... I dunno about necesarily unplugging it altogether, but whatever O.o
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