About .Mac data transfer limits
.Mac monitors the amount of "data transfer" (the amount of information viewed by visitors to your websites) associated with each .Mac account in order to ensure a high level of performance for all .Mac users. When you purchase a .Mac membership, you receive 10 gigabytes (GB) of storage and up to 100 GB of data transfer capacity per month.
Every time someone accesses content you've published to .Mac, your data transfer usage is adjusted. For example, if you publish a 50 megabyte (MB) movie, and 10 of your friends view it, 500 MB of your allotted data transfer quota will have been used.
If you're close to exceeding your monthly data transfer limit, you'll receive a message from the .Mac team. You can use up to half of your monthly quota during the first 15 days of a month. If you exceed your data transfer limit, any website, blog, or podcast associated with your .Mac account is turned off and service will not be reinstated until the 1st or 16th of the month (Pacific Standard Time), whichever comes first.
You can check your data transfer usage at any time in the Details section of your Account Settings page. (To see your Account Settings, go to
www.mac.com, log in, and click Account in the left column.)
As specified in the .Mac terms and conditions, member data transfer limits are determined by the amount of .Mac storage you have. You can increase your monthly data transfer limit up to 200 GB or 300 GB per month by adding more storage space to your .Mac account. For more information, search for "storage and data transfer capacity" in .Mac Help.