I've never had 2 of the same pistol. I briefly still had a S&W 640 after buying a 340PD, while waiting for a buyer.
Over the years, I've carried a dozen different guns. If one is taken/stolen/damaged, I'll just carry another one. G43, G26, G30S, 4513TSW, BG380, 340PD. They all shoot fine.
What's the difference between going back to a gun I used to carry and buying something new to start carrying (as many people often do)?
If I really miss it, I'll buy another as others have said.
If I ever have time and money to start competing, I would buy a backup.