Broadband Access in Central & South America

[AtlasRider]

I'm planning a long trip through Central and South America next year. I am a "vlogger" and take videos while I am on the road (YouTube - AtlasRider's Channel).

I would like to upload videos while I am on the road and so I am wondering about the broadband capabilities of the net cafes in Central and South America. Is it mostly dialup and the idea of uploading a 200MBs of video is ridiculous, or do they have broadband in many places?

Without broadband I think I may just mail back CDs that I burn while I am on the road and then have a friend upload them back home. So, another question would be, how costly would sending thin envelopes back to the US be? I make a lot of videos so this would be done on a weekly basis. I have heard the reliability of the mail being questionable, so I may even send two copies to increase my odds.

Any idea? Thanks