Answer:

microfilm

Answer	Crossword Clue
MICROFILM	Storage medium
MICROFILM	Cloak-and-dagger item.
MICROFILM	Space-saver for data filing

MICROFILM	Archivist's material
MICROFILM	Certain storage method

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.