Should I go into ETFs or a savings account now?

With €25,000 and the time horizon you've got, honestly I wouldn't just park everything in a savings account - the interest rates (currently around 3-4% with good providers) basically get eaten up by inflation and you're not making any real gains. An MSCI World ETF is the better choice long-term, because you can expect average returns of 7-8% over decades, even if it can dip in the short term. I wouldn't see it as an all-or-nothing decision - maybe you put €15,000-20,000 into the ETF and keep a few thousand in a savings account as an emergency fund in case you need cash spontaneously. The psychological side matters too: if you can't sleep at night because the market just crashed 10%, then maybe it's not for you yet - but if you can handle that, there's nothing against going with the ETF.