[PVE-User] Migration to Proxmox VE - Any hints & tips for me?

[Thinker Rix]

Hello dear Proxmox users,

the time has come: I want to migrate both my servers to Proxmox VE.

In preparation to do so, I would like to present you my current setup 
and where I want to go and kindly ask you for some feedback / input / 
hints / advices / links, etc so that I have a solid starting point and 
can "dive" into the world of Proxmox VE.

Current setup:
==================================
1.: Server A in DMZ
- Bare Metal: openSUSE x64
- running KVM hypervisor
- VMs:
     - Ubuntu Server x64:
         - CPU: ACPI/APIC
         - HDD controller: Virtio
         - HDD: raw
         - NIC: Virtio

2.: Server B in LAN
- openSUSE x64
- disk partition 1, approx. 20 GB:
     - the OS running the following services:
         - DNS, NTP, DHCP
         - Directory Server acting as Primary Domain Controller and File 
server (Samba)
- disk partition 2, approx. 1,5 TB:
     - user data


Planned solution:
==================================
1.: Server A in DMZ
- Bare Metal: Proxmox VE
- VMs:
     - <Migration of the currently existing VM Ubuntu Server x64>

2.: Server B in LAN
- Bare Metal: Proxmox VE
- VMs:
     - <Migration of the currently existing bare metal OS openSUSE x64>

Thougths & Questions:
==================================
1. Server A in DMZ:
My idea is that I backup the virtual disk file of the current VM to an 
USB hard disk, then delete everything and install Proxmox VE on the bare 
metal. After this I copy the virtual disk file of the VM back to Proxmox 
by reconnecting the USB hard disk and make Proxmox VE run this file as a VM
a) Do you see any obstacles I have to take care of?
b) Is it possible to connect the USB hard disk for restoring the virtual 
disk file in Proxmox? I have a normal Debian under the hood, isn't it, 
so I should be able to just mount the USB disk and copy the file to some 
place that Proxmox expects such virtual disk files, right? What place is 
that and what would be the procedure be to make Proxmox use this virtual 
disk file as a VM afterwords?
c) Do you see any problems concerning the "specs"of the VM and 
compatibility with Proxmox VE?

2. Server in LAN:
My idea is to make a full disk backup of the current partition 1 (OS and 
server services) with Clonezilla and an rsync-copy of the data on 
partiton 2, both to an external USB hard disk. Then I delete everything 
and install Proxmox VE on the bare metal. Finally I create a VM, run 
clonezilla again and restore partition 1 and the user data of partition 
2 by reconnecting the USB-hard disk.
a) Do you see any obstacles I have to take care of?
b) How about the user data partition? Should I place the data into the 
VM I just created, too, or would it be advisable to create some other 
data drive for that? Would it be possible to create some kind of "shared 
data volume" (on this server, not in the network!) for multiple VMs of 
this server to be able to access the data? Or what do you suggest on how 
to handle the Samba Server and it's user data best?
c) Can I make this partition to be growing instead of the necessity to 
define a fixed size upfront?

Thank you for any feedback & advice!

Cheers,
Thinkerix