1. OneDrive：
OneDrive 或 Microsoft OneDrive 是 Microsoft 提供的文件托管和同步服务。它为用户存储文件、个人数据和共享文件提供了便利。它提供 5 GB 的免费存储空间。它由微软于 2007 年推出，主要供专业工作者使用，用于存储可能需要更高安全性的工作相关数据。
2.乌拉：
Wuala 是一种文件同步服务、文件存储服务、文件版本控制服务和备份存储服务，最初由 Caleido Incorporation 提供，但后来归希捷科技所有。它是由Dominik Grolimund和Luzius Meisserin 开发的。它主要是使用Java开发的。它提供了 5 GB 的免费存储空间。它于2008年推出。
OneDrive 和 Wuala 的区别：
| ONEDRIVE | WUALA |
|---|---|
| It is owned by Microsoft Incorporation. | Originally owned by Caleido Incorporation but was later owned by Seagate Technology. |
| It was launched in 2007. | It was launched in 2008. |
| It offers 5 GB free storage space. | It offered 5 GB free storage space but later on it was made only paid-service. |
| It was developed by Microsoft. | It was developed by Dominik Grolimund and Luzius Meisserin. |
| It provides additional 500 MB free storage space for referral up to 5 GB. | Initially it had referral system but later on referral service was suspended. |
| It has the maximum storage size of 5 TB. | Maximum storage size offered was 2 TB here. |
| It supports file versioning in office files only. | It fully supported file versioning. |
| It does not provide ability to trade local disk storage space. | It provided ability to trade local disk storage space against cloud storage. |
| It is still in use. | This service was suspended in 2015. |
| It was developed using Python, JavaScript, Objective-C and other languages. | It was developed using Java. |