What does file storage and per-site limits work?
With the free account, each of your Sites have 300 MB for file uploads. No more, no less. In the Pro account it works differently. First of all, it is your account that has the storage. Now you can set maximum limits on how much of your storage can each of your Sites use. Let us say you have 10 GB from your Pro upgrade and 5 Sites. Now you could set 1 GB or 2 GB limits for each of the Sites, but you can also set 5GB or even no limits at all. In any of those cases the total files size cannot exceed the per-site limit, and the total used storage cannot exceed your account storage (10 GB in this case). So setting the per-site limits means: use up to X GB from my account’s storage. Of course if your account runs out of free space, you will not be able to upload any new files. If you need more storage, each extra Slot gives you 1 GB. The system of account storage provides a very efficient (and cost-effective) storage space management.
