Method, device, and computer program product for recovering based on reverse differential recovery

An electronic device, comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor and having instructions stored therein, wherein when executed by the at least one processor, the instructions cause the electronic device to perform a method for recovering data in a user system, the method comprising:
• acquiring a reference mapping of the user system, the reference mapping comprising a set of digest information about a set of blocks in the user system;
• receiving, based on an identification of a backup copy for recovering the user system, a copy reference mapping associated with the backup copy from a backup storage comprising the backup copy, the copy reference mapping comprising a set of digest information about a set of blocks in the backup copy;
• determining a difference between the reference mapping and the copy reference mapping;
• and
• recovering the user system to the backup copy based on the determined difference.

A computer program product tangibly stored in a non-transitory computer-readable medium and comprising machine-executable instructions for performing a method, the method comprising:

• acquiring a reference mapping of the user system, the reference mapping comprising a set of digest information about a set of blocks in the user system;
• receiving, based on an identification of a backup copy for recovering the user system, a copy reference mapping associated with the backup copy from a backup storage comprising the backup copy, the copy reference mapping comprising a set of digest information about a set of blocks in the backup copy;
• determining a difference between the reference mapping and the copy reference mapping;
• and
• recovering the user system to the backup copy based on the determined difference.