consider the following sentence:
Once all data are collected, it is exported as ...
I am not sure whether it is correct to use the word 'it' in this context?
consider the following sentence:
Once all data are collected, it is exported as ...
I am not sure whether it is correct to use the word 'it' in this context?
I would not write it like that. You are confusing the count defintion of data and the non-count definition.
Either:
Once all data are collected, they are exported ...
Or:
Once the data is collected, it is exported ...
Don't mix them up.