Is it safe to have all my money at Fidelity?

Hello there, I've been considering putting all my savings into Fidelity for quite some time now. But I can't help but wonder, is it truly safe to have all my money invested in just one place? I understand they're a reputable institution with a long history of success, but isn't it risky to put all your eggs in one basket? What happens if something unexpected occurs, like a market crash or a data breach? I'd appreciate any insights you might have on this matter. Thank you!