If your backup data got corrupted and deleted by mistaken then in this situation i personally recommend you this effective
BKF data recovery software to repair corrupt BKF files in just one click and can recovers all data from the BKF file created with this utility.
This software will generate a LOG file of the BKF files recovery process in text format. This LOG file contains all the information of file scanning and recovery processes from which user can save this file for future reference.
Use this free demo version of this software which help the users to evaluate it function and capabilities. It allow the users to see the preview of all recovered files and folders. To save the recover data you have to buy full licensed version.
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BKF File Repair