The pros and cons of storing files in "the cloud" IMHO:
The pros:
Availablity: you have your data available anywhere you go (if you have internet access of course)
You can store a relatively large amount of data without having to worry about the storage capabilities of the client computer.
It is easier to share data with other people / to do workgroup.
The cons:
Security: you need to trust that the storage provider will treat your data confidentially and it has strong enough security measures in place to prevent unauthorized access.
Unavailability: you can't continue working if for some reason you temporarily lose connectivity (this can be anyway partially solved by using data caches).
Performance, as you have mentioned, especially with very large amounts of data.
So, bearing this in mind, you decide what's best for your particular project.
Konamiman's answer is a good one, I just wanted to add one thing to the pros: some cloud providers have Content Delivery Network integration, like Rackspace with Limelight, which can give end users very fast content delivery.
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在“云”中存储文件的优点和缺点恕我直言：
优点：
缺点：
因此，记住这一点，您就可以决定什么最适合您的特定项目。
The pros and cons of storing files in "the cloud" IMHO:
The pros:
The cons:
So, bearing this in mind, you decide what's best for your particular project.
Konamiman 的答案很好，我只是想向专业人士添加一件事：一些云提供商具有内容交付网络集成，例如 Rackspace 与 Limelight，它可以为最终用户提供非常快速的内容交付。
Konamiman's answer is a good one, I just wanted to add one thing to the pros: some cloud providers have Content Delivery Network integration, like Rackspace with Limelight, which can give end users very fast content delivery.