If a BKF file, created by NT-Backup utility, gets corrupted, you can’t restore any thing from it. A corrupted BKF file becomes inaccessible and can’t be restored by NT-Backup utility. In such situation, you have to try some third-party software like BKF Recovery Tool software which can recover inaccessible data from corrupted backup file. This software helps to recover large backup file or provides a facility to repair corrupted backup file to extract selected or all backup file data in well manner.
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