Is there a way to edit Templates with a text editor?

[Preds]

I'm working on installing a Welcome Hack that requires some template modifications.

I was hoping to do modify the templates in a text editor so I could make sure I had a backup of the file, but can't find the actual template files.

Where are the template files stored? Specifically "forumhome", and how can I back this up before editing it?

I also need to add and edit some vB phrases. Where and how is this done? Do I have to use the AdminCP or can I do this by editing a file with a text editor?

Thanks in advance for your help.

BTW my board is vB 3.0.0 Gold