Tested with 4936f76 test data can be found on digitalcorpora.org
mmls Narcos-3.001
GUID Partition Table (EFI)
Offset Sector: 0
Units are in 512-byte sectors
Slot Start End Length Description
000: Meta 0000000000 0000000000 0000000001 Safety Table
001: ------- 0000000000 0000002047 0000002048 Unallocated
002: Meta 0000000001 0000000001 0000000001 GPT Header
003: Meta 0000000002 0000000033 0000000032 Partition Table
004: 000 0000002048 0001023999 0001021952 Basic data partition
005: 001 0001024000 0001226751 0000202752 EFI system partition
006: 002 0001226752 0001259519 0000032768 Microsoft reserved partition
007: 003 0001259520 0062912511 0061652992 Basic data partition
008: ------- 0062912512 0062914559 0000002048 Unallocated
Backup header is stored in sector 62914559 and backup partition table starts at sector 62914527
Tested with 4936f76 test data can be found on digitalcorpora.org
Backup header is stored in sector 62914559 and backup partition table starts at sector 62914527