When you upload and store a file in your workspace it will be fully encrypted. When you retrieve or download a file from your workspace it will be decrypted using your private keys.
When a file is encrypted its size actually increases by 70 to 80%. We made sure however that this doesn't affect your storage. To calculate how your storage is affected, we only take the original file size into account and not the size of the encrypted file. (This actually means that the truly allowed storage for your workspace will actually be somewhere between 1.7 and 1.8GB)
Adding extra storage through an upgrade of your plan can be asked through our support.