1.亚马逊S3：
Amazon S3代表Amazon Simple Storage Service。它是Amazon Web Services提供的一种云存储服务。它通过Web服务界面提供对象存储。它允许存储任何类型的对象，例如用于分析，数据存档，备份和恢复，灾难恢复，混合云存储和Internet应用程序的数据湖。它由AWS在2006年推出。
2. Ubuntu One：
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。它提供了用于在云上存储文件以及从云流式传输音乐的服务。它由Canonical Ltd.开发。适用于Windows，OS X，iOS，Ubuntu和Android。它提供了5 GB的可用存储空间。它于2009年推出。
Amazon S3和Ubuntu One之间的区别：
| AMAZON S3 | UBUNTU ONE |
|---|---|
| It is owned by Amazon. | It was owned by Canonical Limited. |
| It was launched in 2006. | It was launched in 2009. |
| It does not free storage space. | It offered 5 GB free storage space. |
| It was developed by Amazon Web Services (AWS). | It was developed by Canonical Ltd. |
| It has the unlimited maximum storage size. | Maximum storage size was unlimited here also. |
| Developer API is REST and SOAP. | It supports developer API. |
| 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 5 GB per file and unlimited files per bucket. | 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 requires credit-card details for free trial. | It did not require credit-card details for free services. |