with one thing i am struggling a bit (this is a theoretical question not real life scenario)
Upgrade path from 7.x to 10.x is clear as a day... but what i am having trouble understanding, after each upgrade what is happening with data on a backup repository?
if backup will be taken with 7.x and i will upgrade VB&R to 9.5 or 10 then what options i have to be able to restore taken bakcups? or to avoid this kind of a scenario i would need to do something after each jump in between versions?
Correct, components on all involved servers would need to be upgraded as well. That wouldn't affect the existing jobs provided you disable them prior to the entire upgrade procedure.