gistfile1.txt

       In  some cases nano will try to dump the buffer into an emergency file.
       This will happen mainly if nano receives a SIGHUP or  SIGTERM  or  runs
       out of memory.  It will write the buffer into a file named nano.save if
       the buffer didn't have a name already, or will add a ".save" suffix  to
       the  current  filename.   If  an  emergency file with that name already
       exists in the current directory, it will  add  ".save"  plus  a  number
       (e.g.  ".save.1")  to  the current filename in order to make it unique.
       In multibuffer mode, nano will write all  the  open  buffers  to  their
       respective emergency files.