Two factors, quality and heat. If you buy bad quality they will last a short time. If the fixture is not designed to dissipate heat it will last less time. I found out the last one for a couple of mine. The ceiling lights with a shade kinda of a bowl like. The LEDs ones lasted less than a year. Then one of them I didn’t find the nut for it and put some other one that didn’t fit quite well but let the air flow and that one outlasted the other ones. Yes heat will kill your LEDs.
Haven’t tried it, since I only sync with my PC and cloud server. But I just checked up and Librera has an option to save progress and profiles to a custom directory, so I guess that would be the way.
These are the ones I actively use with syncthing
I also did this, I feel it’s better this way. Also the modem restricted me in so many ways. Now my cheap router gives me far more freedom and control. Forwarding ports, no problem. DNS change, no problem. Other SSID, no problem. A separate isolated SSID for visits, absolutely. And if a I change ISP I only have to connect the new modem and no need to change any of my devices.
This is the reason I upgraded to Trixie six months ago. Wish I knew better about back ports. Can’t wait to be back in stable release for that server. Love Incus.