backup Synonyms

backing substitute stand-in backup man championship fill-in spare standby reserve accompaniment reliever support extra relief patronage reserve fund soundtrack second-stringer tailback knockoff helping hand egis supporting surrogate surrogation understudy vicarial vicarious amicus curiae cc 2nd musical accompaniment energiser backrest computer backup fallback supportive potentiation read out rearguard relief pitcher second string spare part sunnah unreplaceable reinforcements spares reinforcer sinking fund locum