Hosted Criteria: Storage Quotas define the maximum storage space (MB or GB) permitted for your Wiki by the hosting service before:
1) You are prevented from storing anymore:
Presented a Message like= Out of Storage Space
2) You “find” yourself in a new payment program
Oops! Make sure you understand agreement conditions
3) You have to delete old stuff to make room for new stuff
A variation of 1)!

Some services specify Storage Quotas in two classes:
1) Wiki pages: many may have UNLIMITED
Note that some services count pages so understand page conditions
2) File storage (MB or GB):
for your document, image, video, spreadsheet and other files uploaded.

How much Storage Space do you need?
Go look at your computer's directories with files like those you will be uploading to see the number of files (estimate) for the service's storage maximum.

Understand your options when storage space runs out:
What cost for additional SPACE?