您不必，SyncToy 2.1支持升级安装。
有关详细信息，请访问 http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=c26efa36-98e0-4ee9-a7c5-98d0592d8c52 。

升级的件数信息：

升级：
- 如果从早期版本的SyncToy升级（例如SyncToy 1.4或SyncToy 2.0） ），它是 ** CRITICAL ** ，以确保在运行SyncToy 2.1设置之前使用以前的版本完全同步所有文件夹对。升级后第一次运行SyncToy 2.1时，不遵循此准则可能会导致意外行为和部分数据丢失。升级完成后，所有文件夹对也必须至少完全同步一次。

感谢，
平

My old laptop was synced to my server using ver 1.4. Now, I want to sync the server to a new laptop using 2.1. Do I need to delete the synctoy sync files from the server?

You do NOT MUST to, SyncToy 2.1 support upgrade installation.
For further details info please go to link http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=c26efa36-98e0-4ee9-a7c5-98d0592d8c52 .

Pieces info for upgrade:

Upgrade:
- If upgrading from an earlier version of SyncToy (e.g. SyncToy 1.4 or SyncToy 2.0), it is **CRITICAL** to ensure that all folder pairs are fully synchronized using the previous version before running SyncToy 2.1 setup. Not following this guideline can lead to unintended behavior and partial data loss when running SyncToy 2.1 for the first time after upgrade. All folder pairs must also be fully synchronized at least once right after the upgrade is done.

Thanks,
Ping