In the process of installing an add-on, I updated the template forum_list. I had no trouble finding it in Admin > Appearance > Templates > forum_list, but where is it on my host server web space? I looked in /forum/library/XenForo/Templates, but I couldn't find it there. I really wanted to make a backup copy before modifying it.
Just go back into Appearance -> Templates -> forum_list and copy that to a text document.
The only way to have templates as files on the server is to enable the setting in the ACP "Fetch public templates as files" but you MUST have a opcode cache installed on your server (APC, eAccelerator, XCache etc.)