You can buy more licences for your account or upgrade the storage space if you need to, no matter what type of account you have.
Do this:
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Click on the icon in the top right corner and select "Account settings"
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Click on "Subscriptions" in the left menu and on "Price plan" at the top.
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Select whether you want to extend Backup Licenses or Sync Licenses in the lists
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Press "Update" to confirm
If you don't see any options for upgrading, keep in touch and we'll help you.