first let me tell you i have tried and give it a try on Proxmox it is very easy via helper script. but there are some cons and pros too

I'm noob in Computer Sciences so i cant configure on my own by general knowledge if given specific instructions to follow yes i can do that.

the reason i want Proxmox is iam running 4-5 servers on of minipc which are Immich, Adguard Home, Homeassistant, Frigate and some upcoming years i will add some more.

first my most important questions

1: It is better to configure Immich on Docker VM/LXC on Proxmox?
2: what if a just simple setup a Debian base image and install immich on it via docker?
3: how to Recover backed-up data from immich already running on docker ubuntu to this setup? and is the new proxmiox immich is future proof of updates?
4: i have multiple servers running i want to share same storage to other LXC/VM too is that possible too?
5: is this easy to return to my Ubuntu docker setup if my Proxmox doesn't satisfy my needs?

any expert in Proxmox having configured successfully Immich and all my related questions would like to help me i would be very thankful to him/her.

Breaking News! ;-)

https://github.com/virtio-win/kvm-guest-drivers-windows/pull/1653

https://github.com/virtio-win/kvm-guest-drivers-windows/commit/f5e50c8bed233d96140536701934d55d09a59e8b

Version 0.1.302 is the currently broken one who needs workaround in qemu config for the VM-guest to function properly, so keep an eye on this URL for when update is released (as in newer than 0.1.302):

https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/latest-virtio/

Workaround:

args: -set device.scsi0.discard_granularity=16K

discard_granularity size should match whatever zvol volblocksize you are using (by default 16k in Proxmox 9.x).