Tips for Migrating Windows VMs from Proxmox to Hyper-V

If you only have a few VMs to transfer, consider using Veeam Backup & Recovery. It’s a great tool, though the free version limits you to 10 VMs, and you’ll have to manually manage licenses which can be a hassle if you have lots to move.

You can definitely convert to Gen1 and then switch over to Gen2 afterward. After migration, boot the VM using WinPE or setup media to run MBR2GPT. This way, you can convert the disk to GPT format, allowing you to create a Gen2 VM that boots UEFI. It’s a simple workaround to ensure you have the UEFI capability without hassle.

When migrating, I've typically used `qemu-img` for converting disk formats. It's pretty straightforward and allows you to convert to .vhdx, which works well for Gen2 VMs. Just make sure to check whether your disk is set up with GPT or MBR, as that will determine what VM format you should use. If needed, you can adjust the partitions after conversion with usual tools you’d use for physical drives.

I actually moved from Hyper-V to Proxmox and found using the Veeam trial really simplified things. I took a full backup prior to migration, then used incremental backups just before the switch. Restoring to Proxmox was easy, though the toughest part was adjusting the network settings afterward. I'm sure the reverse process will be similarly smooth with the right tools!

The guide you mentioned uses `qemu-img convert` correctly, but note that it's better to use `-O vhdx` instead of `-O vpc` since the latter is outdated. If you’re working with Gen2, remember you'll need to manage the UEFI flash properly to ensure everything boots up correctly.