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. SugarSync：
SugarSync是由J2 Global提供的云服务和文件同步服务。它可以主动同步计算机系统和其他设备中的文件，以进行备份，访问和共享。 Windows，macOS，iOS和Android操作系统均支持它。它由J2 Global在2009年推出。它不提供免费的存储空间。它提供付费的有限和无限存储空间。
Amazon S3和SugarSync之间的区别：
| AMAZON S3 | SUGARSYNC |
|---|---|
| It is owned by Amazon. | It is owned by J2 Global. |
| It was launched in 2006. | It was launched in 2009. |
| It was developed by Amazon Web Services (AWS). | It was developed by J2 Global. |
| It does not offer free storage space. | It also does not offer free storage space. |
| It provides unlimited maximum storage space for paid. | It provides limited as well as unlimited maximum storage space for paid. |
| It requires credit-card details for free trial. | It does not require credit-card details for free trial. |
| It has the unlimited maximum storage size. | Maximum storage size is 60 GB for personal paid and unlimited for professional paid. |
| It supports file versioning. | It also supports file versioning. |
| Developer API here is REST and SOAP. | Developer API here is REST. |
| It has Amazon S3 limit as traffic or band-width limit. | It has traffic or band-width limit of 10 GB per day for free and 250 GB per day for paid. |
| Maximum file size is 5 GB here. | Here maximum file size has no restriction. |