The Major difference between third party tool (Veeam) versus native backup(Azure or AWS). in azure backup client/user will be locked with OEM . Where is in Veeam you can keep data in Azure blob or AWS bucket.  

Veritas NBU appliance is an integrated Purpose-Built backup appliance and includes backup software, RHEL OS and storage for keeping backups.   Veritas supports a single point of contact for the OS, backup software and storage and, thus, eliminating the dependency of multiple…

As mentioned by many Veaam is best suitable for virtualized environments.  As to Veritas, it has 2 products: Backup Exec and NetBackup.  Veritas NetBackup is more suitable for Heterogenous OS and Database environments.  Veritas Backup Exec is suitable for SMB and mid-sized…