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back somebody up = to support somebody;

back away (intransitive) = to go back slowly

back out (intransitive) = to withdraw from a previous committment.

Prasal verb	Translation	Examples
back somebody up	appoggiare qualcuno	We decided to back up their candidate because he had promised to intervene for the solution of our problem.
back away	spostarsi all’indietro	As soon as he got out his knife Paul backed away to keep at distance.
back out	tirarsi indietro da un impegno assunto	He promised that he would sign our petition but later he backed out because he feared the consequences of that act.