The term 'safe storage' can be summarized by the crossword solution 'CACHE, ' which is a five-letter word. A CACHE is a type of storage that is used to store data temporarily in a computer system or other electronic device. It is designed to provide quick access to frequently used data and is often used to improve the performance of a system. Caches are also used to store important data securely, making them an ideal choice for safe storage.