Can I delete the duplicate turbotax file of the same name which is periodically updated in the same folder which is preceded by the "~" symbol (what is its function)?

[AnthonyC · Accepted solution]

They are called tilde files and they are a byproduct of the autosave feature.  They are basically backup copies of the return so you are free to delete them, but you might want to keep at least the most recent one around just in case.