I carry a 365. My backup to that is my console vault pistol, which for now is a G19.

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I've run a bunch, currently its my G19 at work. Fits my zippered cargo pocket with a desantis nemesis.

Seecamp 380

Sometimes on my body, but always in my car. About a year ago, I had a couple of guys jump in my back seats while I was parked in heavy rain. They thought I was their Uber. I would of had no chance to draw from under a seatbelt if it was the real deal. There is now a 2nd gun under passenger seat cushion.

My normal everyday carry if I go out for dinner or grocery run is generally a Ruger LCP Max. When I go to work and since I already have the LCP Max in my pocket usually. When I put on my other pistol for work. It naturally become the backup to my SIG M18X or my SIG P210 Carry.

Seecamp 32 ACP in a DeSantis pocket holster.

Glock 42 in a Desantis Ankle holster

2 folding knives for the last 30+ years.

P938

It's hard to beat a G42 as a backup. The little guns are reliable and accurate for what they are.

I had pocket carried a gen1 shield for several years. Moved to a shield plus when it came out but the very slight increase in grip size felt massive in the pocket. I came to realize capacity wasn't most important especially in a back up gun/pocket gun.
I moved to a p938 and it disappears in a pocket. It also surprised me that the p938 shoots like a much bigger gun for me. It's more comfortable to shoot and more accurate than my shield or shield plus.

I started out with a J-frame 642 in a pocket holster as my duty BUG. Hated it, but it was the best option at the time.

Then went to a Kahr PM9 in a pocket holster as my duty BUG. Hated it only a little less, but it was the best option at the time.

Now I've been promoted to the point where I no longer carry a BUG, but were I to need to do so again, I'd carry my P365 in a pocket holster as a BUG.

I did an informal poll of my staff and it became evident I"m literally the only one carrying a backup weapon...

...modern semi-auto's are so reliable, you don't need a backup...
...ankle guns are unsafe...maybe we should prohibit them...
...it's a generational thing...only you old timers carried those

Maybe there is some truth to that last one...when I started we were just transitioning to semi-auto's and a lot of staff still carried revolvers. Possibly with the lower round counts in the wheel guns the backup weapon was more relevant...however I still believe one is none, two is one...