1.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。
2. Ubuntu 一：
Ubuntu One 是由 Canonical Limited 提供的文件托管服务、文件同步服务和云服务。这是一个基于 OpenID 的单点登录服务。它提供了在云上存储文件以及从云中传输音乐的服务。它由 Canonical Ltd 开发，适用于 Windows、OS X、iOS、Ubuntu 和 Android。它提供了 5 GB 的免费存储空间。它于2009年推出。
Zetta 和 Ubuntu One 的区别：
| ZETTA | UBUNTU ONE |
|---|---|
| It is owned by Zetta Incorporation. | It was owned by Canonical Limited. |
| It was launched in 2008. | It was launched in 2009. |
| It does not offer freeware service. | It offered 5 GB free storage space. |
| It was developed by Jeff Whitehead, Lou Montulli and Jason Harrison. | It was developed by Canonical Ltd. |
| It is still in use. | This service was suspended in 2014. |
| Files stored here are encrypted. | Files stored in Ubuntu One were not encrypted. |
| It is a commercial file synchronization and cloud-based backup service. | It was a commercial file synchronization service. |
| It was supported by Windows, OS X and Linux. | It was supported by Windows, OS X, Android, Ubuntu and iOS. |
| It does not have freeware version. | It had freeware version. |