this is the result of DBCC CHECKDB (dbname) WITH NO_INFOMSGS, ALL_ERRORMSGS:

Server: Msg 8929, Level 16, State 1, Line 1

Object ID 2: Errors found in text ID 124886646784 owned by data...

Thanks alot every one :

the problem was related to the sqlsrvr account permissions

Thanks Adiga for your help ,

but 'igmastback' is the filename

i have used it as itis onece

and another one as 'igmastback.bak'