1. Google云端硬盘：
Google云端硬盘是Google提供的文件存储和同步服务。它允许用户存储文件和个人数据以及共享文件。它提供15 GB的可用存储空间。它由Google在2012年推出。几乎与互联网相关的每个人都在使用它。每个人都用它来存储一些专业和个人数据。
2. Zetta：
Zetta是Zetta Incorporation提供的文件同步服务和基于云的备份存储服务。它是由Jeff Whitehead ， Lou Montulli和Jason Harrison开发的。它主要用于中小型企业和企业。它不提供免费版本。它主要用于存储专业数据而不是个人数据。它于2008年推出。 Google云端硬盘和Zetta之间的区别：
| GOOGLE DRIVE | ZETTA |
|---|---|
| It is owned by Google LLC. | It is owned by Zetta Incorporation. |
| It was launched in 2012. | It was launched in 2008. |
| It offers 15 GB free storage space. | It does not offer freeware service. |
| It was developed by Google. | It was developed by Jeff Whitehead, Lou Montulli and Jason Harrison. |
| It is a file hosting service. | It is a file synchronization service. |
| It provides cloud storage service. | It provides cloud based backup service. |
| It is used by individuals, small and larger enterprises. | It is used by small and medium sized enterprises. |
| It provides storage service for personal data. | It does not provide service for personal data and is used for professional work only. |
| It supports file versioning. | It does not support file versioning. |
| It has freeware version. | It does not have freeware version. |
| It is supported by Windows, OS X, iOS and Android. | It is supported by Windows, OS X and Linux. |