By safest to have them locally I mean:
- a guarantee that they will always work, with or without internet connectivity
- that the templates will show correctly without latency (like if there is a delay in retrieving the fonts)
- the template will not show default fonts before switching to webfonts
- the fonts won’t will be removed without notice
The HTML producer is basically run with most (if not all) sandboxes disabled.
What version of CCG are you using? I’m guessing if the webfonts don’t display they aren’t available in a format usable in 2.0.7. If they aren’t working in 2.1/2.2 you need to provide more information.