A method for cloud application redundancy, comprising: acquiring first description information of a cloud application needing redundancy, wherein the first description information comprises information about a source network used at a production site by the cloud application needing redundancy and information about a source virtual machine used at the production site by the cloud application needing redundancy; generating second description information of the cloud application needing redundancy according to the first description information, wherein the second description information comprises information about a backup network used at a redundancy site by the cloud application needing redundancy and information about a backup virtual machine used at the redundancy site by the cloud application needing redundancy; and providing the second description information for the redundancy site, so that the redundancy site recovers the cloud application needing redundancy according to the second description information; wherein the information about the source virtual machine used at the production site by the cloud application needing redundancy comprises: an identifier and specifications of the source virtual machine, information about a first storage unit occupied at the production site by the source virtual machine, and information about a home network of the source virtual machine; and the information about the backup virtual machine used at the redundancy site by the cloud application needing redundancy comprises: an identifier and specifications of the backup virtual machine, information about a second storage unit occupied at the redundancy site by the backup virtual machine, and information about a home network of the backup virtual machine; wherein the information about the home network of the source virtual machine comprises an association between a virtual network adapter of the source virtual machine and the source network; and the information about the home network of the backup virtual machine comprises an association between a virtual network adapter of the backup virtual machine and the backup network; and wherein the information about the source network is information about a subnet where the source virtual machine running the cloud application is located, or information about a virtual local area network where the virtual machine running the cloud application is located, or both; and wherein the information about the backup network is subnet information of the backup network, or VLAN information of the backup network, or both. acquiring first description information of a cloud application needing redundancy, wherein the first description information comprises information about a source network used at a production site by the cloud application needing redundancy and information about a source virtual machine used at the production site by the cloud application needing redundancy; generating second description information of the cloud application needing redundancy according to the first description information, wherein the second description information comprises information about a backup network used at a redundancy site by the cloud application needing redundancy and information about a backup virtual machine used at the redundancy site by the cloud application needing redundancy; and providing the second description information for the redundancy site, so that the redundancy site recovers the cloud application needing redundancy according to the second description information; wherein the information about the source virtual machine used at the production site by the cloud application needing redundancy comprises: an identifier and specifications of the source virtual machine, information about a first storage unit occupied at the production site by the source virtual machine, and information about a home network of the source virtual machine; and the information about the backup virtual machine used at the redundancy site by the cloud application needing redundancy comprises: an identifier and specifications of the backup virtual machine, information about a second storage unit occupied at the redundancy site by the backup virtual machine, and information about a home network of the backup virtual machine; wherein the information about the home network of the source virtual machine comprises an association between a virtual network adapter of the source virtual machine and the source network; and the information about the home network of the backup virtual machine comprises an association between a virtual network adapter of the backup virtual machine and the backup network; and wherein the information about the source network is information about a subnet where the source virtual machine running the cloud application is located, or information about a virtual local area network where the virtual machine running the cloud application is located, or both; and wherein the information about the backup network is subnet information of the backup network, or VLAN information of the backup network, or both.