My nexus 4 is not storing new Wi-Fi passwords. Each time I want to connect to a previous connected Wi-Fi I have to re-enter the password.

I found that in `Settings > Backup & Restore` everything is checked but `Backup account - No account is currently storing backed up data` is in gray and i can't do anything about it.
In `Settings > accounts > google` i have everything sync but Movies & TV and photos.

I'm running kit Kat, not rooted.
Any help will be appreciated