Is there a relationship between an Active Full and subsequent Synthetic Fulls?

[StoopidMonkey]

If I start a backup chain on Sunday with an Active Full and it's incrementals from there forward with Synthetic Fulls every following Sunday, what happens to the backup chain if I delete said Active Full from the disk? Veeam seemed to think only the incrementals between the AF and the next SF were compromised, but doesn't the Synthetic reference data from the oldest Full job in the chain?

[Mildur]

Hi Chris

From a backup file view in the explorer, the synthetic full doesn‘t depend on the active full.
You can delete the active full and you will be able to restore from backups starting with the next synthetic full. Only the incremental backups between the AF and SF are not usable anymore.

The dependency is only on block level, if you use FastClone enabled Backup Repo (refs or xfs).
If a block from the active full goes corrupt, and this block is also used/referenced in the synthetic full, then your synthetic full will be corrupted too.
Same could happen for Dedup Appliances or Object Storage too. But these are stable systems (enterprise level normally) and it happens extremely rarely