Forgotten pattern lock

Hi am new here. i need help . i have an android tab i which i forgot pattern lock. i can reset it, but i have important data inside . so i went into recovery mode and made a .backup file. then i did hard reset. now i tried restoring .backup file. it came back to same pattern lock again which i have forgotten. either i need solution to unlock pattern lock or application to extract .backup file and recover my data.. pls help..