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I don't know if this is better, but...an alternative is rclone, which uses rsync under the hood. It can also do parallel jobs and is restartable on any failed partial copy.
When I've had to do large Synology-to-Synology moves, that's what I've used. The multiple rsyncs in parallel really helps if you've got a lot of small files.
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I consider it much better because rsync can detect bit errors and robocopy can't.
The issue with rclone compared to rsync for existing files is it will copy the whole thing again, where rsync uses something called delta transfer and only transfer the change. But if you are doing one time cloud to cloud transfer then yeah rclone is the gold standard.
> rsync under the hood
Is it? I think one is written in C (rsync) and the other is in Go lang (rclone)
Moving Synology-to-Synology, I was surprised at how easily I could just move the original HDDs (in their original order) from old enclosure to new enclosure, and it just worked.