I had a quick question about forward incrementals, reverse incrementals, synthetic fulls and VBK files.
As I understand it Veeam will keep enough backup files (incremental or fulls) to fulfil the amount of retention points for a job. So, if I have a job that has 7 retention points and creates a synthetic full backup on a Friday I could potentially end up with 3 vbk files as i would need those to maintain the vibs that are part of the retention policy. I believe it would look something like the below
VBK - vib - vib - vib - vib - VBK - vib - vib - vib - vib - VBK
I'm currently in a situation where i don’t have the space to support another VBK file for the job. Could i get around having another VBK file by using roll backs? Would i still end up with multiple VBK files or would the roll backs be treated as good enough to support the retention points i need? In my head i'm seeing Veeam essentially taking the vibs and turning them into vbrs without having to create another VBK at all, but I’m not sure that’s how it actually works.
So, take the below. What would happen when the synthetic full runs on the Friday? Would it remove the Wednesday vbr at the end of the chain, then merge the m, t, w, th vibs in to the VBK and then create vbrs of them? Or would it create a new VBK file for the Friday resulting in two VBK files?
vbr - vbr - VBK - vib - vib - vib - vib
Hopefully the above makes sense?