My questions would be...is that the only 2 days that were erased? Don't they have some type of database or backup systems that keep these records?

"Ohio's Rob Portman, the top Republican on the Senate Homeland Security Committee, said he was “deeply concerned” over the letter.
“I am deeply concerned by the letter I received from the DHS Inspector General documenting the Department’s delays in producing materials to the Inspector General and its deletion of records following requests by the Inspector General. It is essential that the Department be transparent with its inspector general, Congress, and the American public,” he said in a statement."