LBFtool

Tool to extact files from LG .lbf file

Usage:

1. Clone or download this repository
2. Install python 3 (check with "python --version")
3. Install pycryptodome (easy way: "python -m pip install pycryptodome")
4. Edit Settings inside extract.py (if needed)
5. Run the script: "python extract.py LGBackup_xxxxxx.lbf"

If you are interested in technical details see:

this XDA-developers post