Hi, if you have ReFS/XFS option enabled, the tool sizes for a weekly spaceless synthetic full. If you have it disabled, it sizes for a weekly active full.

Reverse is not something that is widely used in the field, so it was decided to leave it out for simplicity sake, and because we knew that as of v13 (now), it is deprecated.

In practical terms, the above should cover pretty well most remaining backup mode scenarios…

From a storage perspective: True block-for-block synthetic and active full are net the same; while spaceless synthetic and forever forward incremental are net the same.

Certainly a few exceptions come to mind (monthly Active, or multiple full days, some non-storage resource allocation, for example), and we may expand for this down the line.

What options are you looking to see?

As far as your comment on the tool’s precision, we would love to hear your feedback on what could be made more precise? It’s worth noting that while there has always been a number of unofficial tools (yet excellent ones like the RPS you mention), this project is the first official Veeam calculator, which has formulae provided/blessed by various internal QA/R&D staff.

The ability to choose active full backups with ReFS disabled, in this tool how can set?

In fact in RPS it is possible to set up more frequent complete backups to understand what is happening.

Hi ​@ghost_ale I'm thinking about your question, and it occurred to me that if the block cloning function weren't enabled, the size of the full file generated by the synthetic full operation would be the same size as the file generated by the active full , wouldn't it?
So the calculator wouldn't need to have an option to select an active full or a synthetic full . Does my thinking make sense?

Hi ​@ghost_ale, yes, as ​@AndrePulia summarizes: Turning off block cloning/refs/xfs checkbox provides you “true” synthetic or active full style storage consumption:
 

v.s.
 

​@david.tosoff Thank you David, that is good to know that I’m on the right track :-)

Sorry but I can’t see! REFS function!

last question, if I had REFS active, if I do an active full backup will it still take up the entire space?

Ops I see only now 

After clicking yellow banner, reload → In advanced :)

so you confirm, if enable ReFS and I use Active Full Backup no entire space used?

You need to toggle on the advanced 

just uncheck the REFS/SFX option , the calculator will give you a regular synthetic/active full (no block will be saved because the block cloning technology wont be used.

​@ghost_ale If you think that is solved you question, please, remember to mark as a “best answer” :-)

Not quite. If we’re talking about how VBR works (vs. Calculators), running an active full takes the entire space irrespective of whether you’re using block cloning. In the calculators it is not possible to achieve the config you describe. It’s one or the other.