创建我完整的Ubuntu 19.10系统的.iso映像

I'm going to update to Ubuntu 20.04 from Ubuntu 19.10, and I would like to create an .iso image of my current system and burn it to a USB to restore it in my pc if anything goes wrong. I wanted to keep all my root files and programs installed in /opt and everywhere else.

Is that possible? How can I create that .iso image of my system? I know how to burn it to a USB, but I don't know how to create the .iso file.

任何帮助将不胜感激。

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