backing store

13 LETTERS · STARTS WITH B

backing store is a valid 13-letter word worth 21 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

B3A1C3K5I1N1G2S1T1O1R1E1

3 + 1 + 3 + 5 + 1 + 1 + 2 + 0 + 1 + 1 + 1 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does backing store mean?