Default [INFO] Not possible to setup default Google backup without Dropbox app

I'd like to share one thing regarding default Google backup.

There is a backup option in Settings/Backup & restore, where it is possible to setup a backup using Google Account or HTC Account. When a custom ROM made from stock is used and Dropbox is not installed, it is not possible to setup backup to Google account. Clicking to "Backup account - Set up Google account" does nothing. Solution is to install Dropbox, then it is possible to select Google account and of course HTC account. HTC Backup rely on Dropbox, but neither of them have any connection to Google backup. A HTC bug or drawback of using custom ROM? - Whatever, main is that there is a solution for this tiny thing.

I use [ROM] Android Revolution HD 4.18.401.2.