that's the fun part, you don't. Sony downloads updates anyway (even if you set the option off) as long as you're connected to the internet, so if you miss click it's over
Easiest way is to make a backup using the PS4's built in feature. swap the drive, restore.
if you dont wanna get a 1tb drive, saving only the save files and configs to an external drive is pretty much the only way you have
Caller -"Everytime I start a Pc game on my S24, playing on a external monitor, someone calls or texts me, n it kicks me out of the game." Customer Support - Click (hangs up)
I found it funny cause many many years ago, had a roommate in college that did this same dumbass branding of the school logo, but it didn't look anything like it after it healed. Just looked like a birthmark.