Hi, I don't have this folder in Application Support
If you have run byteball on this mac you should have it.
Try this in terminal:
zip -r ~/Desktop/byteball.zip ~/Library/Application\ Support/byteball
This should put byteball.zip (which would be your backup) on your desktop.
Yeah my bad, I wasn't looking in users/...Library, but in Computer-> Library (fresh mac user)
I found it now, thanks, this zip command show me the way