Depending on which license you purchase, the license permits the full backup of either 1, 3 or 5 systems (PC or Mac), and 3, 10 or 15 mobile devices respectively. If Acronis True Image Cloud is properly set up, your full system backup will be optimized and your backup file will not be significantly larger than PC you are backing up. In order to ensure the best experience possible for all of our Acronis Cloud Customers, we monitor our networks to ensure there is no excessive abuse of the Acronis Cloud. Acronis does not throttle bandwidth or limit storage size, but does reserve the right to impose limits on excessive abuse. Acronis reserves the right to set reasonable storage limits in the future (i.e. 15TB / PC or Mac on Unlimited Accounts).