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My understanding of rsync was that it was pretty painfully slow.
I use rsync for this purpose and the only notable bottleneck is my download speed, fwiw.
I don't know if this applies to you, but don't use the compression flag (-z) for files that already is compressed (like video). The transfer will get CPU bound quickly if you have a fast internet connection.
I went from 13 Mbytes/s to 200 by removing the -z flag, and the compression ratio was non-existant anyway.
The only time rsync is really slow is when your dealing with millions of small files since it only transfers a single file at a time.
rclone is better in that respect since it transfers multiple files in parallel. I don't think the speed of a single transfer is going to differ much.
That must have been it, appreciate the clarification.
How did you "understand" that it would be slow? Did you look at the code?