Hello,<br/><br/>The book <i>English Phrasal Verbs in Use: Advanced</i> lists this example sentence:<br/><br/><i><b>He's kept his old bike as a <u>standby</u>.</b></i><br/><br/>I sometimes say things like the following (probably influenced by my computer education, where the word <i>backup</i> is extremely common):<br/><br/><i><b>He's kept his old bike as a <u>backup</u>.</b></i><br/><br/>Is my usage correct or shall I stick to the word standby?