1. 保管箱：
Dropbox 是美国公司 Dropbox Incorporation 提供的文件托管服务。它提供云存储、文件同步、个人云和客户端软件。它成立于 2007 年。 Dropbox 是由两位麻省理工学院的学生Drew Houston和Arash Ferdowsi 开发的。它仅提供 2 GB 的免费存储空间。它是最早的云存储服务之一。
2.泽塔：
Zetta 是由 Zetta Incorporation 提供的文件同步服务和基于云的备份存储服务。它由Jeff Whitehead 、 Lou Montulli和Jason Harrison 开发。它主要用于中小型企业和企业。它不提供免费软件版本。它主要用于存储专业数据而不是个人数据。它于2008年推出。
Dropbox 和 Zetta 的区别：
| DROPBOX | ZETTA |
|---|---|
| It is owned by Dropbox Incorporation. | It is owned by Zetta Incorporation. |
| It was launched in 2007. | It was launched in 2008. |
| It offers 2 GB free storage space. | It does not offer freeware service. |
| It was developed by Drew Houston and Arash Ferdowsi. | It was developed by Jeff Whitehead, Lou Montulli and Jason Harrison. |
| It is a file hosting and file synchronization 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 LAN synchronization. | It also provides LAN synchronization. |
| 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, Linux, iOS, Android and Blackberry. | It is supported by Windows, OS X and Linux. |
| It uses block-syncing to update changes quickly. | It does not use block-syncing to update changes quickly. |