Where do you keep your poker bankroll.

Let's say the standard bank roll for NL cash is 20 Buy ins. Do you all keep the 20 on the sight at once. lets say your four tabling 200NL or 400Nl do you guys really keep 20k on there at once or do you put it in an interest earning account. How many buy ins do you guys keep online at once. Do you ever get scared that the site might just close? Especially the smaller sites. It seems like even though it is best to keep a deep bankroll you won't be needing it most of the time. Also do you keep more buy ins for higher limits or more buyins if you multi table?
Also, once you let say double on a table do you leave. Or do you just stay and use the advantages of playing short stacked?

20 buy-ins means 20 table buyins. For 400nl this is 8k. no need to keep this much on the site though...
oh, and if i double up i like to stay. If you have a skill edge, playing deep only makes this edge bigger and better. Right now I'm 8-tabling, >200bb deep on two, and >150 on one other. The players that got me that way are still there. No way that I'm leaving...

as for keeping dollars online and not earning interest. For me it's around $5k at the moment so not such a concern. I imagine/hope I'll have to start re-thinking that soon though... Then my plan is to use an onine bank in US$ and free transfers to and from neteller...