Being backed for cash games..

[Python49]

I have a friend who has alot of money due to being in business for himself. He works with large $ amounts but I will not elaborate. Anyway, he actually knows I play poker and offered to back me to play in higher stake cash games since i've talked to him sometimes and told him how i'd love to stab at a higher game but don't want to rush anything. Problem is, i'd hate to lose his money since we are friends in real life and i'd probably feel worse about it than he would. Would anyone be backed by a friend if they say had.... 20k and were playing 400 nl, and he offered to back you for 2k nl. Has anyone actually done this? How'd it work out.