[Samba] Debian. recommended way to migrate Samba DC from stable to backport ?

[Dr. Nicola Mingotti]

Hi,

I am running a Samba AD/DC in a Linux Debian Bullseye stable.

My motivation to try the backport package is that is the  way to keep 
the Debian package and still be able to put Windows-11 in the domain. 
Also, many times I red here it is recommended to use the latest Samba 
stable release.

I installed a backport package only once (wireguard in buster, wireguard 
was not even existing in buster stable) so I am a bit worried I am going 
to mess up the important Samba DC server with my scarce experience with 
backports.

I made a backup already of the VM providing the Samba DC, just in case.

I tried to "over-install" the backport on the existing stable samba 
package but it gives me a few errors
---------------------
$> sudo apt install  samba/bullseye-backports
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Selected version '2:4.16.5+dfsg-1~bpo11+1' (Debian 
Backports:bullseye-backports [amd64]) for 'samba'
Selected version '2:4.16.5+dfsg-1~bpo11+1' (Debian 
Backports:bullseye-backports [all]) for 'samba-common' because of 'samba'
Selected version '2:4.16.5+dfsg-1~bpo11+1' (Debian 
Backports:bullseye-backports [amd64]) for 'samba-common-bin' because of 
'samba'
Selected version '2:4.16.5+dfsg-1~bpo11+1' (Debian 
Backports:bullseye-backports [amd64]) for 'samba-libs' because of 
'samba-common-bin'
Selected version '2:2.5.2+samba4.16.5-1~bpo11+1' (Debian 
Backports:bullseye-backports [amd64]) for 'libldb2' because of 'samba-libs'
Selected version '2.3.3-4~bpo11+1' (Debian Backports:bullseye-backports 
[amd64]) for 'libtalloc2' because of 'libldb2'
Selected version '1.4.6-3~bpo11+1' (Debian Backports:bullseye-backports 
[amd64]) for 'libtdb1' because of 'libldb2'
Selected version '0.11.0-1~bpo11+1' (Debian Backports:bullseye-backports 
[amd64]) for 'libtevent0' because of 'libldb2'
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
libtevent0 : Depends: libtalloc2 (>= 2.3.2~) but 2.3.1-2+b1 is to be 
installed
samba : Depends: libldb2 (>= 2:2.5.2) but 2:2.2.3-2~deb11u2 is to be 
installed
         Depends: libtalloc2 (>= 2.3.3-3~) but 2.3.1-2+b1 is to be 
installed
         Depends: libtdb1 (>= 1.4.6-2~) but 1.4.3-1+b1 is to be installed
         Depends: samba-libs (= 2:4.16.5+dfsg-1~bpo11+1) but 
2:4.13.13+dfsg-1~deb11u5 is to be installed
samba-common-bin : Depends: samba-libs (= 2:4.16.5+dfsg-1~bpo11+1) but 
2:4.13.13+dfsg-1~deb11u5 is to be installed
                    Depends: libtalloc2 (>= 2.3.3-3~) but 2.3.1-2+b1 is 
to be installed
                    Depends: libtdb1 (>= 1.4.6-2~) but 1.4.3-1+b1 is to 
be installed
E: Unable to correct problems, you have held broken packages.
---------------------

. Should i uninstall the "samba" stable package before ?
. If I uninstall the "samba" package will all my domain configuration be 
lost ?
. Should I install the required dependencies for the backport package by 
hand or will apt do alone as usual ?
. Any other suggestion from your experience ?

Thank you in advance.

Nicola