Backup-sfb has been updated to support 2019

I really didn't think I'd do it, but given the ammount of requests for it and a verification of versions included in Skype for Business 2019. I have decided to "officially" update my Backup script to SFB 2019.
It has not been thoroughly tested by me (as I don't have any customers using sfb2019 yet), and there is no guarantee it will back up everything. Feedback and suggestions are of course very welcome!

The script is also no longer signed. If I do get around to buy a new certificate, I might sign it again in the future.

As before, the script can be found at the technet gallery (link)