Baidu is the biggest search engine in China. It also provides generous cloud storage service for its user. They offer you 2TB of storage for free. You can register her:
If you have an account in Baidu and you work with it in Air Explorer, remember you have to revalidate your account sometime, and this days Baidu ask you a telephone number for security. It is not required to access your account, you only have to close the window and you can work with Baidu.