backstore noun2 •An area in the back of a store or shop.I had dinner with Henry Bornstein in his very confined living quarters (between his shop and his backstore) during which he gave me an interesting account of some orthodox Jewish customs. — 2003 •A back end data storage; a backing store device.The most recent control units (3 GB cache size) provide a much better performance although the cache/backstore ratio is similar. — 2004 formsbackstores