If you plan to be a way before preload date, just leave your PC on and Steam launched before leaving. It should auto download and be ready when you return.
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Don't really want to risk my house burning down bud.
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Unlikely to happen unless you really don’t trust your electrical in your house. And the preload is actually up to steam not Bungie. Usually preloads only come up a few days prior to the launch so depends on when you go on vacation.