Your english is fine mate, don't worry about that
The way I planned to do it was...
original #-Z packs
new update packs each month (every two months at the moment!)
new #-Z packs at xmas
so there will only ever be a maximum of 12 update packs on my site at once.
I felt it was the best way to reduce the number of outdated/duplicate/errored files in the packs because the crap is cleared out once every year.
I hope that makes sense!