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Solved: How do I backup logs in plaintext format avoid performing LZ4 decompression?

This article describes that backup logs in plaintext format avoid LZ4 decompression.

By default, if the logs are backed up to the FTP server, logs will be encrypted.

# execute backup disk alllogs ftp <IP_address> <username> <password>
# execute backup disk log ftp <IP_address> <username> <password> <log_type>

If it is necessary to upload the logs to Fortianalyzer, it is necessary to decrypt it using LZ4 and then upload it to the FortiAnalyzer.


FortiGate version 7.0.4+


After 7.0.4+ Firmware, in all Firewall models, it is possible to add an uncompressed parameter at the end of the command ‘# execute backup disk log ftp’ to have a cleartext file and that will be easier to upload to the Fortianalyzer.

# execute backup disk alllogs ftp <IP_address> <username> <password> <compressed | uncompressed>
# execute backup disk log ftp <IP_address> <username> <password> <log_type> <compressed |uncompressed>

Now decompressed logs which can be uploaded to FortiAnalywer.


  • This feature is present only in 7.0.4 and above.
  • If you are trying to uncompress the log file using lz4_reader and it gives a java error, then use jdk-8u351-windows-x64.exe,

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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