Ok, maybe i have to clarify more precise.

The goal is to have backups each month within volume files each max size of 
25G. 
If the backup exceed 25G there should be 2 Volumes created for that month.
The next month it should use a new Volume for the backup, no matter how much 
space is left on the last used Volume.

Monthly i burn the Volumefiles to bluerays. And after i ve burned it i can 
delete the volume file manually if needed.  

the example pool is a try, to get this to work. As you mentioned it isn`t doing 
what i want to achieve.

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