I just figured out a way to have Scratch "remember" something, a background, for instance, when just using a variable would cause interference.
[blocks]<{ background }><{ oldbackground }><set{ oldbackground }to( <{ background }> )><set{ background }to( 0)>[/blocks]
Later:
[blocks]<set{ background }to( <{ oldbackground }>)>[/blocks]
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