The problem with the thread you link, is that the advice given for cryptolocker protection is wrong:
If SMB is enabled at all, that alone is a cryptolocker risk - you don't even need a valid user account to spread a cryptolocker on SMB, all you need is for the port to be open.
Veeam should not be relying on SMB functionality for backups at all, as we can not trust that SMB is secure, even in up to date Windows installs (recent events show it is riddled with security vulnerabilities).
Is there any non-SMB solution for the free version of Veeam? (it does not have to be FTP, that was just a suggestion)