Mrs. Clinton did not have a government email address during her four-year tenure at the State Department. Her aides took no actions to have her personal emails preserved on department servers at the time, as required by the Federal Records Act.
Well I guess that takes care of looking for backups. Hillary is certainly no Lois Lerner.
Under federal law, however, letters and emails written and received by federal officials, such as the secretary of state, are considered government records and are supposed to be retained so that congressional committees, historians and members of the news media can find them. There are exceptions to the law for certain classified and sensitive materials.
It really doesn’t matter, rules are for the little people.