Can I target my opponent's minion(s) with Backstab?
Yes (but remember the spellcaster must be in the same region as all the targets).
If a minion has voidwalk and is in the void, could Backstab move it to an adjacent site to strike a tapped minion there?
No. Your spellcaster must target both minions (which are in different regions), but that's impossible since you pick a single location the spellcaster occupies for casting a spell. You can only target minions in the region where the spell is being cast. See 'Casting Spells' for more details.
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