Yeah, of course I don't keep them in plain text, I use a password manager and I've also encrypted the file, I've made multiple backups in case something goes wrong. At first, I had 2-3 passwords and was using them for different accounts but then I discovered that many website don't have good security and they often get hacked.
I know it's not a good practice but years ago, when I was a kid, I was using Google Chrome because it was very popular. I was saving my passwords on Google Chrome and then Chrome was reporting to me that most of my accounts were hacked and the password was leaked, so that was the moment that woke me up from my comfort zone and then I took all of these account-related things very seriously.