# Overview

### What is Cloud Disk? <a href="#what-is-cloud-disk" id="what-is-cloud-disk"></a>

A cloud disk is a highly available, highly reliable, low-cost, and customizable block storage device. It can be used as an independent and expandable disk of a cloud server, providing efficient and reliable storage capabilities for cloud server instances.



### Cloud Disk Billing <a href="#cloud-disk-billing" id="cloud-disk-billing"></a>

Cloud disks currently only support on-demand.&#x20;



### Product Features <a href="#product-features" id="product-features"></a>

Cloud disks provide a variety of persistent storage devices. Users can store files, build databases, etc. on the hard disks by themselves.

* Attach and Detach: Cloud disks support elastic attach and detach. Multiple cloud disks can be attached to a cloud server to build a large - capacity file system.
* Create Backup: Cloud disks support creating snapshots and snapshot rollback, which can backup and restore critical data in a timely manner. It also supports creating hard disks using snapshots to quickly implement business deployment.
