This is not a bug. From the gdisk man page's description of the backup
option:
b Save partition data to a backup file. You can back up your cur‐
rent in-memory partition table to a disk file using this option.
The resulting file is a binary file consisting of the protective
MBR, the main GPT header, the backup GPT header, and one copy of
the partition table, in that order.
A "dd" backup of the first 34 sectors will include the protective MBR,
the main GPT header, and the partition table. By design, gdisk's backup
option inserts a copy of the backup GPT header between the main GPT
header and the partition table. Because the primary and backup headers
are similar (but not identical), you will of course see what appears to
be duplicated data when you examine a gdisk backup file with a hex
editor.
** Changed in: gdisk (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1367464
Title:
Backup operation seems to be duplicating information
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