I have been trying to get this answer for a few days, and it is holding up my setup. When you get to the schedule page of a backup, it will give you four options. Maybe three depending on how I am understanding. I am not sure I understand them all, NOR do I get which one is the best to go with. In the user guides, Veeam doesn't really spell out that this type or that type will work better than another.
So, the four I am thinking about is Reverse incremental, Incremental (Forever forward) and (Create synthetic), and Active full backup.
-- Reverse incremental seems cool as it seems to leave you with one full backup at the latest point.
-- Forward forever which seems to be the default and best way to back up. What makes this FF is that you don't use the synthetic backup or the Active full backup.
So, I am testing, and I am using hourly backups to see what it is doing. With forever forward, I am getting (every hour):
Then the next incremental would replace the oldest. Obviously incremental #1 would be the oldest and 14 would be the newest. If Veeam replaces #14, it would keep the chain going, but after a month, incremental 14 would be completely up to date, but since it is not a differential, it would rely on incrementals which may be one or more months old. Or does it replace #1, then the next replace #2, which would give you full backups when you add the incremental.
Just seems that using the Create active weekly, would be safer if you added to the FF. But, Veeam makes it sound as though you would then not be using FF. And, if you schedule Active full, would the new incrementals work with it. It just seems in an important production environment, going an entire month with added incrementals before you get to a new Full would be risky. Maybe these incrementals are much better than I am used to. Of course, there is the synthetic option and the reverse option. But, Veeam just tells you these options are available and does not seem to go into much detail as to which is best for any given situation.