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I agree, this should be somewhere in the FAQ-- maybe it is, then it should be somewhere easier to find.
I just did even a bigger upgrade, 2.0.9.2 to 2.2.3a, and I found it easier than I expected to be, since the uploads are small except for one. I actually did *not* update the System after every install, just the last one, and it still worked OK. I also went and uploaded new/updated all the main modules while I was at it, since I have heard some old versions of some modules can sneak in with the updates.
I have three or four more sites to do this weekend (sigh). An auto-updater for XOOPS would be a dream.
One thing I never realized-- if you're using an FTP program, you can drag all the folders and files into your server directory, and it will automatically update only the new files in the folders. I assumed if you dragged a folder to a directory with folder of the same name, it would replace the whole folder, but it actually overwrites just the files it needs to and leaves others alone. So the updating goes a lot faster now than before when I would manually open each folder and directory.
T