1. 云：
iCloud 是苹果公司提供的云存储和云计算服务。它允许用户将文档、照片和音乐等数据存储在远程服务器上，以便下载到 iOS、macOS 或 Windows 设备。它还能够与其他用户共享和发送数据。如果 Apple 设备丢失或被盗，管理它也很有帮助。它于2011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。
iCloud 和 Ubuntu One 的区别：
| ICLOUD | UBUNTU ONE |
|---|---|
| It is owned by Apple Incorporation. | It was owned by Canonical Limited. |
| It was launched in 2011. | It was launched in 2009. |
| It offers 5 GB free storage space. | It also offered 5 GB free storage space. |
| It was developed by Apple. | It was developed by Canonical Ltd. |
| It has the maximum storage size of 2 TB. | Maximum storage size was unlimited here. |
| It is still in use. | This service was suspended in 2014. |
| Files stored here are encrypted. | Files stored in Ubuntu One were not encrypted. |
| Maximum file size is 50 GB here. | Maximum file size was 5 GB per file. |
| It is a file hosting and cloud storage service. | It was a commercial file synchronization service. |
| It has traffic or band-width limit of 200 or 400 or 600 GB per month. | It has Amazon S3 limits as traffic or band-width limit. |
| It is generally designed for macOS and iOS. | It supported Windows, OS X, iOS, Ubuntu and Android. |