Last night I have made the upgrade from OMV 7 to OMV 8. There were minor issues that were caused by services that I am using, but I was able to fix them. I have waited a little longer this time because I wanted drivers to catch up to the newer kernels that would come with Debian 13. This time I was not able to enable GPU hardware acceleration with kernel 6.17, no matter what I tried (even by activating Backports from OMV extras). Debian wiki page says that there should be a way to use Nvidia driver 550 with kernels up to 6.19 kernels, but I was not able to have the drivers compiled with Proxmox kernel 6.17. It is a shame that I had to use mainline Debian kernel 6.12 to have it working. I even tried to use a newer driver (580 was recommended by Nvidia) with kernel 6.17. I think I was using Proxmox kernel 6.11 with OMV 7 and Debian 12 before the upgrade.
I need it because I am running Jellyfin and I have a GTX 1060 for that exact purpose. With every major Debian upgrade I had to tweak and change how I install drivers and what I am installing. I am aware that OMV does provide kernels. It is mostly a heads-up for people trying to use the Proxmox kernels (like me) with GPU hardware transcoding/acceleration on Nvidia GPU.