Q:

Do I need multiple font faces if I upload a custom font face? 

I have a bunch of uploaded fonts in my website's folder.  I understand that you need a backup font if the usual font is not available, but if I am uploading the font, do I still need this?  I would think not, but let me know.  Thanks. 

A:

Yes, adding a CSS font stack is the best practice.  It's easy to do and can only make things better and more reliable, and there are no downsides.  For example, say that a site is being loaded on a very slow connection on an outdated smartphone, the font might not load at all or the text could load before the font.  A font stack can provide a reasonable alternative or smooth the jump from the system font to the loaded one, Century Gothic to Avenir rather than Times New Roman to Avenir.