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. 糖同步：
SugarSync 是 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。它受 Windows、macOS、iOS 和 Android 操作系统支持。它由 J2 Global 于 2009 年推出。它不提供免费存储空间。它为付费用户提供有限和无限的存储空间。
Dropbox 和 SugarSync 的区别：
| DROPBOX | SUGARSYNC |
|---|---|
| It is owned by Dropbox Incorporation. | It is owned by J2 Global. |
| It was launched in 2007. | It was launched in 2009. |
| It was developed by Drew Houston and Arash Ferdowsi. | It was developed by J2 Global. |
| It offers 2 GB free storage space. | It 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 supports less types of file formats. | It supports more types of file formats. |
| It does not fully support file versioning. | It fully supports file versioning. |
| Maximum storage size is unlimited here. | Maximum storage size is 60 GB for personal paid and unlimited for professional paid. |
| It has traffic or band-width limit of 20 GB per day for free and 200 GB per day for paid. | 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 10 GB and unlimited using client application. | Here maximum file size is not restricted. |
| It provides additional 500 MB free storage space for referrals up to 18 GB paid. | There is no referral system here for gaining free storage space. |
| 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. |