Reinstalling Win10 alongside Linux Mint

Question

I have a 750GB drive that is failing, but still functional (I already backed up what can't simply be reinstalled), and I would like to reinstall Win10 on the SSD (I assume my key should still be valid, but this is not the problem here), probably in the 500GB gap, but I could add another HD if that's better.

• I know there were many problems installing Windows after Linux and I would like to avoid scrapping everything on the SSD, even if I could theoretically do it, as I have backups and the Z2 array, which I assume won't be touched; OTOH, I seem to understand these problems are (almost?) gone with modern UEFI boot.

I have a rather modern PC with:

• 1TB SSD containing Linux Mint 20.2 "Ulyssa", with ~500GB of free space for sda2/sda3, and another ~350Gb of free space at end

  /dev/sda1       2048     264191    262144   128M EFI System
  /dev/sda4  975587328  983400447   7813120   3,7G Linux swap
  /dev/sda5  983400448 1283399679 299999232 143,1G Linux filesystem
  

• 4x identical 3TB drives in a ZFS Z2 array, providing space for /home and other data
• 750GB disk where Win10 is installed with its normal partitioning:

  /dev/sdb1     2048    1023999    1021952  499M Windows recovery environment
  /dev/sdb2  1024000    1228799     204800  100M EFI System
  /dev/sdb3  1228800    1261567      32768   16M Microsoft reserved
  /dev/sdb4  1261568 1465145343 1463883776  698G Microsoft basic data
  

  
  

What steps should I follow to maximize my success chances?

• A full guide would be best, but a list of possible pitfalls and how to steer clear would also be welcome; I am aware of this answer, but I'm unsure if it applies to Win10

WIP: I will update this section to reflect my attempts.

Following @JW0914 input I tried to create an "image" on my NAS (syno0).

I opened a PowerShell as Administrator and then:

PS C:\WINDOWS\system32> New-SmbMapping -LocalPath 'X:' -RemotePath '\\syno0\Store'

Status Local Path Remote Path
------ ---------- -----------
OK     X:         \\syno0\Store


PS C:\WINDOWS\system32> Dism /Capture-Image /ImageFile:"X:\recover\Base.wim" /CaptureDir:"C:" /Name:"Windows Backup" /Description:"Base Image 2021.03.20 @ 16:20" /Compress:Max /CheckIntegrity /Verify /ScratchDir:"X:"

Strumento Gestione e manutenzione immagini distribuzione
Versione: 10.0.19041.1


Errore: 32

Impossibile accedere al file. Il file è utilizzato da un altro processo.

Il file di registro di Gestione e manutenzione immagini
distribuzione è disponibile in C:\WINDOWS\Logs\DISM\dism.log
PS C:\WINDOWS\system32>

Sorry for the Italian text, it essentially says:

Error: 32
Impossible to access file. File is in use by another process. 

I assume I should try to issue this command either from "Safe mode" or from "Preboot Environment", but I don't know how (I'm a Linux guy). Any pointer welcome.

Another problem I see with "instructions" is I assume I will have to make (at least) two images: one for my setup and one for WinPE, right?

If so I have no idea how to access WinPE partition from Win Dism.

Another problem is I would like to add the partitons to my SSD, so I think using Diskpart ... clean could be trouble; also here I would need some guidance, if possible.