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. Backblaze B2：
Backblaze B2是由Backblaze Incorporation提供的云存储服务。它与Amazon S3和其他云存储服务非常相似。它是一个对象存储服务。它由Backblaze Incorporation在2015年推出。它提供10 GB的免费存储空间。它还为高级帐户提供了无限的存储空间。它也被称为B2云存储。
Amazon S3和Backblaze B2之间的区别：
| AMAZON S3 | BACKBLAZE B2 |
|---|---|
| It is owned by Amazon. | It is owned by Backblaze Incorporation. |
| It was launched in 2006. | It was launched in 2015. |
| It was developed by Amazon Web Services (AWS). | It was developed by Backblaze. |
| It does not offer free storage space. | It offers 10 GB free storage space. |
| It provides unlimited storage space for paid. | It also provides unlimited storage space for paid. |
| Maximum file size in Amazon S3 is 5 GB. | Here is no such restrictions. |
| Files are encrypted at servers. | Files are not locally encrypted. |
| It supports file versioning. | It also supports file versioning. |
| It charges comparatively more for additional storage that means it is more costly. | It charges less for additional storage that means it is less costly. |
| It provides full security of data. | It provides more security of data. |
| It requires credit-card details for free trial. | It does not require credit-card detail for free services. |