Well when I had my iPhone it all through iTunes. If it's all through iCloud now, what's the difference than through Google Storage?
My Android is backed up via google cloud oh and it's all free, no storage fees if I go over a certain bandwidth. Backs up calendar, photos, contacts etc.
My Nexus blew up one day, got a new phone, turned it on, logged in with my gmail account and everything was back from my old phone.
So having a Mac or PC doesn't really matter, never need it.