As a noun stepback is
(chiefly|attributive) a piece of furniture whose upper section is further back than the lower part, forming a flat shelf or step between them.
backaway
Not English
Backaway has no English definition. It may be misspelled.
stepback
English
Noun
(
en noun)
(chiefly, attributive) A piece of furniture whose upper section is further back than the lower part, forming a flat shelf or step between them.
- a stepback cupboard