Linux system backup method and Linux system repair method

The invention comprises a Linux system backup method and a Linux system repair method. The Linux system backup method includes steps of performing 32-bit weak calibration and 128-bit MD4 strong calibration on the basis of rsync commands, computing difference between current system files and backup files in a short time, and adding newly-added files or modified files into an original backup file when in a second backup after the first backup of the system by the backup method. The Linux system repair method includes: repairing lost or modified files with respect to the backup file in the target system when in need of repairing the target system with failures by the repair method.