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. 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。它是一种对象存储服务。它由 Backblaze Incorporation 于 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无限的存储空间。它也被称为 B2 云存储。
iCloud 和 Backblaze B2 的区别：
| ICLOUD | BACKBLAZE B2 |
|---|---|
| It is owned by Apple Incorporation. | It is owned by Backblaze Incorporation. |
| It was launched in 2011. | It was launched in 2015. |
| It offers 5 GB free storage space. | It offers 10 GB free storage space. |
| It provides limited storage space for paid. | It provides unlimited storage space for paid. |
| It is mostly used by Apple product users. | It is used by users using any type of product. |
| It has the maximum storage size of 2 TB. | Maximum storage size is unlimited here. |
| Files are encrypted at servers. | Files are not locally encrypted. |
| It partially supports file versioning. | It fully 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. |
| Maximum file size in iCloud is 50 GB. | Here maximum file size is not limited. |