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What is another word for backup?

What's another word for backup? | Here's a list of synonyms for backup.

Definition 1: the act of providing approval and support - [noun denoting act]

Definition 1: (computer science) a copy of a file or directory on a separate storage device - [noun denoting artifact]

Definition 1: a musical part (vocal or instrumental) that supports or provides background for other musical parts - [noun denoting communication]

Definition 1: someone who takes the place of another (as when things get dangerous or difficult) - [noun denoting person]

Definition 1: an accumulation caused by clogging or a stoppage - [noun denoting process]