US Patent 11436089 Identifying database backup copy chaining

System extracts backup metadata, comprising committed change numbers, system change numbers, types, database version identifiers, and details, for backup copies. System generates data structure, comprising start system change numbers, based on minimums of system committed change numbers, end system change numbers and maximums of system change numbers, database version identifiers, and identifiers including details, for the backup copies. System identifies at least first type of backup copies as candidate dependent backup copies and at least second type of backup copies as candidate preceding backup copies. System outputs identifiers of candidate dependent backup copy, corresponding dependency, and candidate preceding backup copy, based on identifying same database version identifier of candidate dependent backup copy and candidate preceding backup copy, and maximum of end system change numbers of candidate preceding backup copies which is less than or equal to start system change number and/or end system change number of candidate dependent backup copy.