System State Backup Restore - Version 5.1 How to restore system state backup data & other types of BKF files? If you are searching that tool which can easily recover or restore your system state backup files then do not get panic you are at right place at SysTools. We provide you an advanced system state backup restore utility called BKF Repair tool which is able to recover your corrupt BKF files & also able to restore data from damaged system state bkf file. There can be many sudden & uninvited reasons for the corruption of your system state backup file. These causes are unanticipated or accidental & so impossible to prevent. SysTools BKF Repair software can restore system state backup in most of these common corruption cases.* Virus attack or Trojan infection* Hasty system shutdown* CRC error* Windows backup software faulty due to some malfunctioning* Corrupted hard drive* System software failure