1. A snapshot generating method, comprising: receiving, by a cloud operation server, a snapshot creation request for an application from a backup server, the snapshot creation request for the application carrying an identifier of the application, and the snapshot creation request indicating that a snapshot needs to be created for data of the application; determining, by the cloud operation server according to the identifier of the application, a plurality of virtual machines where the application runs; determining, by the cloud operation server, that the virtual machines are deployed on a plurality of deployment servers; and sending, by the cloud operation server, a snapshot instruction to each of the deployment servers at a same time point, the snapshot instruction carrying an identifier of virtual machines deployed on each deployment server and first information, the first information indicating that a snapshot operation has a high processing priority, and the snapshot instruction instructing each of the deployment servers to immediately suspend write operation on each virtual machine deployed on each of the deployment servers and perform the snapshot operations consistently on data of the virtual machines deployed on each deployment server, thereby implementing unified snapshot operations on the virtual machines and ensuring consistency among snapshot data of the virtual machines.