You can create an account by going to hq.app.
You can add an integration by going to the settings, which you can find in the right upper corner of the app. There, you can see which integrations you have already added with their corresponding email address. To add a new integration, simply press the "+" button of the integration you would like to add and follow the steps. After successfully adding your integration, you can search for your files in HQ!
Sadly this is not possible yet. We are working on it though and will let you know as soon as this feature is available. For now, if you want to remove our permissions to your accounts, you can go to the the account provider, e.g. https://www.dropbox.com/account/connected_apps
No we do not store files in HQ. HQ offers a virtual organizing system which means you do not have to move all your files, since they stay stored in the original apps and accounts.
Sadly this is not possible yet. We are working on it though and will let you know as soon as this feature is available.
We never keep copies of files longer than needed to deliver you a speedy service. To be exact, when you use any of these features, we are storing something temporarily:
All other features do not cause any storage on our service. The goal is actually to re-use your existing storage more easily and to not compete with these services.
We are also considering adding an extra option 'Full Privacy Mode' for pro-users, which would remove these functionalities from the app. We also have an Enterprise plan, where the server-part of our app that causes storage can be deployed at the client.