Hello Paul.
Thanks for your advice.
My strategy was based on "backup data once" approach but this would produce to many files I now realize.

But I still want to avoid to backup the entire database (N=0) on regular basis.
Whats your opinion about this approach?
First backup N=0
Every day N=1 for a month (replace file each time)
Increment N next month.

This would produce 12 files every year.

Thanks,
Hugo