There are also assignments and completed tasks that take up storage space. It is important to note that only assignments, completed tasks, and uploaded attachments that can be deleted from the repository take up storage space. Assignments can only be deleted individually, but completed tasks can be deleted in groups (assignment storage space requirement: 0.5 MB/assignment, completed tasks storage space requirement: 0.1 MB/complete). The basic free storage space you can use is 45 MB, and you can add up to 200 MB for free. Note that a well-edited worksheet takes up about 3 MB, but this will vary depending on the number of assignments and attachments you upload.