HEre image attached of one example. index.html and index.html~ appears everytime I finish editing the file. But it does not have any content and it does not go away unless I delete it, but, I am afraid of deleting the actual file. 
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Ken Sandoval
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1Possible duplicate of Prevent gedit from creating files with the '~' (tilde) suffix – muru May 21 '16 at 20:23
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The index.html~ is meant to be a backup of the file.
When you edit a file with Gedit, Ubuntu saves the original as filename~. The backup file is supposed to reflect what the original file looked like before it was edited.
It doesn't contain a whole backup history. It just keeps the last version of the file for you.
TheWanderer
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