Considering security factors, I downloaded the entire OneDrive and transferred it to my self-built Synology Drive today, and also stored a copy on a local external hard drive to ensure data security.

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The speed of OneDrive is... even with a proxy, it's still only 1MB/s, which is really slow. On the Synology side, I used Zerotier to penetrate and used a small VPS from TX Cloud as the MOON node. After OneDrive synchronization is complete, I will upload it to Synology and test the point-to-point speed.