Before purchasing VEGAS Pro Suite 23, I’m wondering what would happen if I had to reset my PC. If I don’t buy the €9.99 disk backup, would I have any problems downloading it again from my account? Or would I need some kind of backup code or authorization?”
If you have a purchased VP23 it should appear in your Magix account from where you can download at any time. On installing you will need your serial number to activate again. The Serial number is also shown in your account.
Plus links for downloading Vegas Pro versions are here on this forum.
Lastly, having downloaded VP you could save the file somewhere safe for future use to avoid having to download again. I keep a copy on external hard drives.
So you don't need to buy the disk backup which nowadays has limited use as PCs don't normally come with optical drives.