Its only from 4.2 to 4.3 so an upgrade is possible. However, I want to make a complete install for 2 reasons...
1) v4.3 supports my new hardware much better then v4.2 did, so I can hopefully remove an old network card and get a much better working SATA. For this reason I have the feeling its better to make a complete reinstall to really know whats working or not.
2) I want to see how its working using a full install together with two custom scripts. One script that prepares the new install by backing up files etc., and one that sets everything up again with new packages and so on. I dont know how I should backup users yet though, thats something im working on right now.
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