[vdr] begginer question

[Mauricio Henriquez]

Hi to all!!!
This is my first post to the list, so me name is Mauricio Henriquez and 
I write you from Chili.

I want to develop a vdr backup system, but one requirement os to support 
USB capture or frame grabber adapters, so I wonder if you can recomend 
me some USB video capture adapter or USB framegrabber adapter fully 
suported on linux (if it is multi-channel for multiple video sources is 
better).

in advance thanks you very much...

Mauricio