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Nice catch. Reproduced here : i440fx doesn't boot with ISO Windows 10 build 1904x.6456 (the EoL build) on a PVE 8.4.16 EPYC 2th Gen host and a PVE 9.1 i5 6th Gen host , vCPU type isn't relevant. EDIT : Only reproduced with the updated iso , with the ISO Windows 10 RTM 20H1 build 19041 boot is OK...

disable Hyper-V feature, so will be back to auto when you enable the Virtual Machine Platform Windows

if device is not mounted, backups are written to / filesystem. umount and delete backups if they exist in the mount point. use chattr +i /mnt/.../proxback to prevent its usage when mount is missing.

Try set "Max perf" power profil in your host BIOS. Do bench to have some numbers comparaison, like Passmark.

Check/adjust your /etc/modprobe.d/zfs.conf then update-initramfs -u -k all

Proxmox VE, with its default vmbr0 Linux bridge, acts like a hardware switch, it does not manage guests network configuration. But you can block ipv6 with PVE Firewall. Enable it in each guest and each guests nic. Then set NDP to "No" in each guest.

if PVE firewall ON , try https://forum.proxmox.com/threads/turning-on-firewall-with-accept-policies-everywhere-makes-hosts-unreachable.182123/post-846186

https://forum.proxmox.com/threads/network-interface-pinning-inconsistencies-iso-installer-vs-pve-network-interface-pinning-generate.179949/

because compression is not reproductible. rsync can't be efficient with compressed stream as data is mixed. hook script at stop is the solution for your use case. Once you have tried PBS, you will keep it. Here PBS alongside PVE. PBS datastore/disk is the real backup data to take care of. PBS...

https://forum.proxmox.com/threads/p2v-windows-xp-0x7b-error.142190/

try disk as ide then search on forum or Web, it's same as baremetal. it's same for XP.

source can't be used in crontab, it's not a Proxmox VE thing.

https://pve.proxmox.com/wiki/Root_Password_Reset

https://forum.proxmox.com/threads/cluster-and-ha-over-wan.104669/post-450914

if Storage name change, rename the tied saved password too in /etc/pve/priv/storage/

switch Lexar to backup then Samsung 990 as the Datastore

is VM use the default vCpu type x86-64-v2-aes ?

auto lo iface lo inet loopback iface nic0 inet manual auto enx00e04c6808f2 iface enx00e04c6808f2 inet static address 10.169.22.5/24 gateway 10.169.22.253 auto vmbr0 iface vmbr0 inet static bridge-ports nic0 bridge-stp off bridge-fd 0

it's same as baremetal, it's not a really Proxmox side. You will find tutos online. System disk need conversion to gpt, then make EFI boot partition to create EFI boot files. BTW, Legacy Boot / SeaBIOS is not Secure Boot capable, and have not certificates.

post your /etc/network/interfaces ( please paste after "Code" forum button )