Go to http://www.acronis.eu/my/cloud-backup/corporate and log in to your account (create one if you are not registered). This is your account management webpage. Here you can get a trial subscription, locate an Acronis partner or buy subscriptions online. The newly obtained subscriptions are listed as available subscriptions on the Manage subscriptions tab.
If you purchased your subscriptions from an Acronis partner, register them manually using the Enter new registration code link. The registration codes come with the purchase confirmation e-mail.
Next, install Acronis software (if not yet installed) and start backing up to Acronis Cloud Storage.