Back up meaning in English

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Definition

(I need) backup: (I need) more people to help me noun
(a) backup (plan): (a plan) for use if another (plan) fails adjective
to back up a file
to back up (physically): to move backwards verb
Exercise 1
'Please tell me you've backed them up!'

From the list below, select the sentence(s) which use(s) the term 'back up' correctly.

There may be more than one correct answer!
'Please tell me you've backed them up!'

From the list below, select the sentence(s) which use(s) the term 'back up' correctly.

There may be more than one correct answer!
This sentence uses 'back up' correctly, and in the same way as it is used in the dialogue. Here, the verb is used figuratively to mean 'to create a copy of' in the context of computers.
This sentence is correct. To 'back up' is to 'move backwards'. The speaker here is rather impolite, but the sentence is grammatically correct. Another example: 'Please back your car up so that I can get out'.
It does not make sense to use the phrasal verb 'back up' here. This sentence should read 'When will you give me my T-shirt back?', meaning 'when will you return my T-shirt?'.
This is a correct statement. Here, 'backup' (as one word) is being used as a noun to mean 'reinforcements' or 'more support'. Here's another example: 'The backup arrived too late, and the bank robbers had already escaped'. It can also be used as an adjective: We need a backup plan in case our first plan doesn't work.

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