I don't believe the OP {europeanflava} is asking how much is insured in accounts.
I believe the question is more asking you to say "I keep $25,000.00 in the bank", OR "I keep 6 month's income in the bank".
In our case we try to keep 2 months gross income a regular bank {coastal} savings account, another 2 months in a money market account in a credit union{local}, and another 2 months in another credit union {regional}.
That way,IF an EMERGENCY happens {loss of job, a hurricane, a flood, a fire, a tornado {rare these parts}, etc, } we have access to funds, and if ONE goes belly up, at least all our money isn't all in one place.
Also, We chose a local, a regional and a coastal institutional so IF a disaster happens here, except the local only credit union, we can go elsewhere {another city, state or the whole coast} to access our funds.
We have 6 months GROSS, which will equal about 8 months net, and about a year austerity cut back of finances.
We are striving for getting a years worth of GROSS for an emergency account, but after going through our savings due to previous job losses, we are drained and struggling to build back up, just having 6 months..
That, is how we do it. For now.