Which of the following statements are true when comparing a synthetic full backup to an active full backup, on a NTFS-based Backup Repository? (Choose two.)
A. In terms of content and retention, the synthetic full backup file is identical to an active full backup file
B. The synthetic full backup file has a .vsb extension, whereas the active full backup has a .vbk extension
C. Synthetic full backups impose less load on the production environment
D. If the backup repository performance is weak, creating synthetic full backups is the best choice
E. Synthetic full backups consume more network bandwidth
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B+C is right: https://helpcenter.veeam.com/docs/backup/vsphere/synthetic_full_backup.html?ver=95u4
Nope.
According to the VSB file pointers, the tape job detects what backup chain and what data blocks on disk are required to synthesize a full backup, and writes these blocks to tape as a full backup file (.vbk).
The backup file itselfs is a .vbk, but during backup process, it uses a .vsb file.