Hi @nelmzee, and welcome to the LE community forum 
This is not a VEEAM forum.
So, you may not get the most accurate / most specific help for that product here.
That said, there are ACME clients for most operating systems and we can help you with that part of the puzzle.
[as for converting a certificate into a .pfx file, there are many ways to do that - some are also "built into" the ACME clients themselves]
So, let us help you better by answering these basic questions:
Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
My domain is:
I ran this command:
It produced this output:
My web server is (include version):
The operating system my web server runs on is (include version):
My hosting provider, if applicable, is:
I can login to a root shell on my machine (yes or no, or I don't know):
I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):