WordReference English-Japanese Dictionary © 2014:

主な訳語
back [sth] up,
back up [sth]
vtr phrasal sepphrasal verb, transitive, separable: Verb with adverb(s) or preposition(s), having special meaning, divisible--for example, "call off" [=cancel], "call the game off," "call off the game."
(computing: make copies)  (コンピュータファイル・データ)~のバックアップをする、~のコピーを作る 他動
Note: single-word form used when term is a noun or an adj
 It is advisable to back up all the files on your computer regularly, in case of breakdown.
 コンピュータが壊れた時のために、定期的にすべてのファイルをバックアップすることを勧めます。
back [sth] up,
back up [sth]
vtr phrasal sepphrasal verb, transitive, separable: Verb with adverb(s) or preposition(s), having special meaning, divisible--for example, "call off" [=cancel], "call the game off," "call off the game."
(confirm: fact, argument)  (事実・事柄)~を裏付ける、~を承認する 他動
 The accused man insisted that his wife would back up his story and give him an alibi.
 被告人は、彼の妻が彼の話を裏付けてアリバイを証明すると主張した。
back up vi phrasalphrasal verb, intransitive: Verb with adverb(s) or preposition(s), having special meaning and not taking direct object--for example, "make up" [=reconcile]: "After they fought, they made up." (move in reverse)  (乗物)~をバックさせる、~を後退させる 他動
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WordReference English-Japanese Dictionary © 2014:

成句・複合語:
bring back up vtrtransitive verb: Verb taking a direct object--for example, "Say something." "She found the cat." (topic: raise again)  (話題)~を再び持ち出す 他動
bring back up vtrtransitive verb: Verb taking a direct object--for example, "Say something." "She found the cat." informal (food: vomit, regurgitate)~をもどす、吐く 他動
  Is something important missing? Report an error or suggest an improvement.
'back up' found in these entries
In the English description:

タイトルに'back up'が含まれているフォーラムディスカッション:

See Google Translate's machine translation of 'back up'.

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