How much of your bankroll should you keep online?

[erc007]

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If you currently have ~250 BIs for your MTTs of choice, how much of that is needed to keep online?

Do you cash out on a regular/consistant basis? Do you try and keep your online bankroll @ a stable # and cash out the profit(what # is that in relation to buyin)? Does anyone keep it all online until they actually need it?

Reasoning appreciated.

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I keep mine safe and secure in an "e-wallet." I mean, what could possibly happen to it there?