Upgrade a PVE Virtual Environment 4.4-24 to the new 8.3

Hello again, everyone. Is it possible to upgrade a PVE Virtual Environment 4.4-24 to the new 8.3? I imagine it can be done from the shell, but could someone kindly write me the commands? I’m not very familiar with Debian and its commands.

Or, could it be done with a USB stick containing the ISO file, by reinstalling everything from scratch? I’m a bit worried because I imagine a fresh installation from USB will erase everything, and I have files on the disk that I don’t know how to retrieve...

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