"Let's make sure not to leave any confidential information behind."
- "Let's make sure not to leave any confidential information behind."
"Let's make sure not to~" 「〜ないようにしましょう」"let's be sure not to ~" もつかえます。
"leave behind" 「置く」・「残す」
"confidential information" 「機密情報」
"leave any confidential information behind" 「機密情報を置く」