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Sentence Correction: Preposition Questions - Split Constructions

Having had a traumatic experience with data loss following computer crashes, the intern backed and copied the file on which she was working as soon as she saw the virus alert.

Incorrect.

This answer choice is grammatically incorrect.

The verb backed requires a preposition to adequately and logically connect to the file. You do not back a file - you back up a file. 

[[snippet]]

Incorrect.

This answer choice repeats the original mistake.

The verb backed requires a preposition to adequately and logically connect to the file. You do not back a file - you back up a file. 

[[snippet]]

Incorrect.

While this answer choice corrects the original Split Construction mistake, it is redundant - the phrase being lost is wordy.

Although it is more concise than other answer choices, this answer choice repeats the original mistake.

The verb backed requires a preposition to adequately and logically connect to the file. You do not back a file - you back up a file. 

[[snippet]]

Well done!

This answer choice corrects the original mistake by adding the requires preposition up after the verb backed.

[[snippet]]
data loss following computer crashes, the intern backed and copied the file on which she was working
lost data following computer crashes, the intern backed and copied the file on which she was working
data being lost following computer crashes, the intern backed up and copied the files on which she was working
data loss following computer crashes, the intern backed and copied the file she was working on
data loss following computer crashes, the intern backed up and copied the file on which she was working