fix #822890, missing argument on abstract source backup method make backup failed on multi-sources instances

     1

\.svn

     2

^build$

     3

^dist$

     4

\.pyc$

     5

\.pyo$

     6

\.bak$

     7

\.old$

     8

\~$

     9

\#.*?\#$

    10

\.swp$

    11

^doc/book/en/apidoc$