Open Mikrotik | Backup File Repack [better]

Opening, modifying, and repacking a MikroTik .backup file is not a native feature of RouterOS, as these files are binary, often encrypted, and intended for hardware-specific restoration. However, by using third-party scripts and community tools, you can unpack these files, edit configuration data (like resetting passwords), and repack them for a customized restore. Understanding the MikroTik .backup Format

Unlike .rsc export files, which are plain-text scripts, .backup files are binary blobs that contain sensitive system data, including user accounts and certificates.

Structure: They typically consist of various .dat (data) and .idx (index) files bundled together.

Encryption: Since RouterOS v6.43, backups are encrypted by default if a password is set. They use AES128-CTR with HMAC-SHA256 for integrity. How to Unpack and Repack MikroTik Backup Files

To modify a backup, you must first convert it from its binary/encrypted state into an editable directory structure. 1. Decrypt and Unpack

The most popular tool for this is the open-source RouterOS-Backup-Tools.

Command to Decrypt:./ROSbackup.py decrypt -i MyBackup.backup -o Decrypted.backup -p your_password

Command to Unpack:./ROSbackup.py unpack -i Decrypted.backup -d unpacked_folderThis creates a folder containing various system files, such as user.dat, which contains encrypted user credentials. 2. Modify Contents (e.g., Resetting Passwords)

Once unpacked, you can perform tasks like "resetting a password" by replacing the user.dat file with one from a fresh, default router configuration.

Identify specific data: Use specialized extractors like ./extract_user.py to view existing user data from the unpacked files. 3. Repack and Encrypt open mikrotik backup file repack

After making changes, you must rebuild the .backup file for the router to accept it.

Command to Pack:./ROSbackup.py pack -d unpacked_folder -o Modified.backup

Command to Encrypt (Optional):./ROSbackup.py encrypt -i Modified.backup -o Final.backup -p new_password Restoring the Repacked File To apply your modified settings:

Repacking or "unpacking" a file is a specialized niche in network administration because these files are proprietary binary blobs designed primarily for a "restore" on the exact same piece of hardware. While MikroTik provides no official tool for editing these files, a vibrant community of developers has built third-party tools to peer inside. MikroTik community forum The Technical Anatomy A MikroTik

file is essentially a container for several system files, primarily Encryption : Files are often encrypted using AES128-CTR (in RouterOS v6.43+) or older

methods. If no password was set, they might be in plaintext, though recent versions encrypt by default using the user's credentials. Internal Structure

: Inside the blob, you'll find the device's configuration database, including sensitive data like user credentials and certificates that a standard command might omit. MikroTik community forum Popular "Repacking" Tools

If you need to unpack or modify a backup, these community-driven tools are the most recognized: RouterOS-Backup-Tools (Python) : Perhaps the most famous tool. It allows you to:

: Convert an encrypted backup to plaintext (if you have the password). : Extract the internal files into a directory. : Reassemble modified internal files back into a Reset Passwords Opening, modifying, and repacking a MikroTik

: It can even swap out the user database from a default backup to reset a forgotten password. RouterOS Backup Tools (Rust)

: A high-performance rewrite of the Python tools, useful for brute-forcing passwords on large wordlists. When to "Repack" vs. "Export"

Before diving into binary repacking, consider if you actually need it:

marcograss/routerosbackuptools: Tools to encrypt ... - GitHub

A random salt of 32 bytes is generated. The password is appended to the salt. salt+password result is hashed using SHA256. AES128- Mastering MikroTik Backups - Free MTCNA Ep.9

To open or "repack" a MikroTik .backup file, you need to understand that these are binary files designed for full system restores on identical hardware. They are not human-readable text and cannot be edited with standard text editors like Notepad. How to "Open" and View Backup Contents

If you need to see what is inside a .backup file without restoring it to your live router, you have two primary options:

Virtual Router Restore (Recommended): The most reliable way to "read" a binary backup is to restore it to a MikroTik Cloud Hosted Router (CHR) or a spare router of the same model. Install a temporary MikroTik CHR instance. Upload the .backup file to the /file menu.

Restore the backup (this will overwrite the CHR's settings). Password recovery: A client forgot the router password,

Run the /export command in the terminal to generate a readable .rsc text file.

Third-Party Decryption Tools: For advanced users, community-made tools like the RouterOS-Backup-Tools on GitHub can decrypt and "unpack" .backup files into their component .dat and .idx files.

Unpack Command: ./ROSbackup.py unpack -i MikroTik-plaintext.backup -d unpacked_backup.

Pack Command: To "repack," you can use the same tool's pack function after making modifications. Binary (.backup) vs. Script (.rsc)

If your goal is to have a file you can easily edit and "repack" manually, you should use the Export method instead of the Backup button. Mastering MikroTik Backups - Free MTCNA Ep.9

Repacking or Restoring a Mikrotik Backup File

The process of repacking is essentially about restoring the backup file to a Mikrotik device or converting it into a format that can be easily read or used. Here’s how you can work with Mikrotik backup files:

edit extracted config (it’s mostly ASCII / command list)

vim payload.bin

1.2 Why Would You Need to Repack?

decompress

lz4 -d payload.lz4 payload.bin

Step 4: Convert back to binary store

python3 /tools/rsc_pack.py /tmp/rsc_dump/config.rsc --output /tmp/modified_store

rebuild backup (with original header values)

cat header.bin new_payload.lz4 > new_backup.backup

But in practice, reliably repacking a modern encrypted MikroTik backup is not feasible without MikroTik’s internal tools or deep access to the original hardware.