Are the macros in Normal.dot? This is unfortunately where most people put their macros. That is because Word uses normal.dot as the default location. This is a BAD idea. BAD.
If they are NOT in normal.dot, then they must be in another template file. Hopefully they are not in a document file.
In any case, you can copy (or move) your macros into another template - hey call it MyMacros.DOT. Use the Organizer to do this. Then...voila! you have a file that just has your macros. You can back it up just like any other file.
When you say they a huge amount of macros, could you be more specific? Macros are in files. They are not held in Word itself. So really, simply backing up those files, backs up the macros.
Of course you can backup normal.dot (if that is where your macros are). Again, this is a BAD idea. Every installation of Word has its own normal.dot, so having a central source for macros (NOT normal.dot) is a GOOD idea. They are called global templates. Use them.
Gerry