1. 保管箱：
Dropbox 是美国公司 Dropbox Incorporation 提供的文件托管服务。它提供云存储、文件同步、个人云和客户端软件。它成立于 2007 年。 Dropbox 是由两位麻省理工学院的学生Drew Houston和Arash Ferdowsi 开发的。它仅提供 2 GB 的免费存储空间。它是最早的云存储服务之一。
2. ZumoDrive：
ZumoDrive 是一种文件托管服务、文件同步服务和基于云的文件存储服务，最初由 Zecter Incorporation 提供，但后来归摩托罗拉移动所有。它由 Zecter Inc. 开发，适用于 Windows、macOS、iOS、webOS、Linux 和 Android。它提供 2 GB 免费存储空间，付费可扩展至 500 GB。它于2009年推出。
Dropbox 和 ZumoDrive 的区别：
| DROPBOX | ZUMODRIVE |
|---|---|
| It is owned by Dropbox Incorporation. | Originally owned by Zecter Incorporation but was later owned by Motorola Mobility. |
| It was launched in 2007. | It was launched in 2009. |
| It offers 2 GB free storage space. | It also offered 2 GB free storage space. |
| It was developed by Drew Houston and Arash Ferdowsi. | It was developed by Zecter Inc. |
| It has the unlimited maximum storage size. | Maximum storage size offered was 500 GB here. |
| It does not use delta encoding technology. | It used delta encoding technology. |
| It is still in use. | This service was suspended in 2012. |
| Maximum file size is 10 GB and unlimited using client application. | maximum file had no limit here. |
| It does not provide intelligent predictive caching. | It provided intelligent predictive caching. |
| It supports Windows, OS X, Linux, Android, iOS and BlackBerry. | It supported Windows, OS X, Linux, Android, iOS and Palm webOS. |
| It shares files through web applications. | While it shares files through links. |
| It uses block-syncing to update changes quickly. | It does not use block-syncing to update changes quickly. |