Will formatting a hard drive erase my files on Dropbox?

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I have a 4 year old Macbook that’s got some hard drive damage. Suppose I upload files I want to save to DropBox. Then I wipe the hard drive of the old MacBook.

Will the files I had moved into DropBox still be there when I login to DropBox from another computer? Or, if you erase the hard disk, do they erase from DropBox as well?

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