Surely you can remember what you did October 22, 2015!
Your first list shows nothing but html files. Obviously they will all open in any browser. You can also open them in TextEdit with a control-click and then select the "Open with..." item in the pop up menu. "html" is simply another word for "text", but it will mostly be full of html tags. What seems strange to me is their location in the "man" folder.
The lower image shows they are all in the "man" and "man1" folders. Those are where the commands for whatever Terminal shell 'language' you
* have installed. "man" is the command for opening the "manual" (which is what no body ever reads). In Terminal, you would type "man" (without the quotation marks) a space and then a command you wanted to know about. You would then see the entry in the manual and what that command does along with any extra parameters you can add or that may be required.
If you get to a point that you have to use Terminal after a crash, you'd probably be better off doing a complete re-install of the OS.
So you can delete those from SD and you'd get them all back on the re-install. One thing I like with Carbon Copy Cloner is that it is easy to deselect files you don't want to back up. Those are mostly System files that will be replaced if/when I do a complete re-install of the OS. Not much use keeping them in a backup that won't used. I imagine SD has similar controls, perhaps other SD users can report where.
* Actually, the OS installs all those.
