Hi,
First of all, I feel very happy that citavi 4 has been realised(although I have not find the relevant training materials for new features). And I write this topic for the possibility of improvement of reference backup. Although I am now a college student, I do know that many professors feel it inconvenient to carry laptops with them when they want to read articles as they are attending conferences somewhere. If they don't want to take laptops, then they have to print the references needed,which is also inconevient. And Cloud Back-up can solve this problem by upload the data to a certain cloud sever, which can also prevent some unexpected tragedy such as laptop lose and data lose.
Best
magicmonk