I am considering taking Escentual's 25% discount promotion as an opportunity to buy Backup Bottles in case of re-formulation for fragrances in my collection. I am excluding ones that are already re-formulations or I have already bought backup bottles for like Dior Sauvage EDT.

I was wondering if of these are worthy for backup bottles purely on speculation of re-formulation:

Carolina Herrera CH Privé for Men EDT
Chanel Allure Homme Sport Eau Extreme EDT
Chanel Allure Homme Sport EDT
Dior Homme Intense EDP
Dolce & Gabbana The One For Men EDP
Dunhill Icon EDT
Giorgio Armani Acqua Di Gio Profumo
Jean Paul Gaultier Ultra Male EDT
Montblanc Individuel EDT
Prada L'Homme EDT
Thierry Mugler A*Men Pure Malt EDT
Valentino Uomo Intense EDP
Versace Pour Homme EDT
Viktor & Rolf Spicebomb Extreme EDP
Yves Saint Laurent Nuit de L'Homme EDT

Any suggestions welcome please.

Many thanks!