Key = SHA1("00" + installation_id + password)[:16]
: Use a tool like marcograss's unpack command to extract the binary contents of a plaintext (decrypted) backup. open mikrotik backup file repack
file is essentially a container for several system files, primarily Encryption : Files are often encrypted using AES128-CTR (in RouterOS v6.43+) or older Key = SHA1("00" + installation_id + password)[:16] :
Before diving into binary repacking, consider if you actually need it: open mikrotik backup file repack
If your goal is to modify the configuration and then repack it:
Remove specific MAC address references so a backup can be applied to different hardware.
Inside the extracted/ directory, you will find a file named usually store or config.dat . This is essentially a raw dump of the ROS NVS (Non-Volatile Storage).