6 hours is roughly 10MB/s, so you likely could have gone much much quicker. Did you compress with `-z`? If you could use ethernetyou probably could have done it at closer to 100MB/s on most deviceds, which would have been 35 minutes.
One thing I could have done is found a way to track total progress, so that I could have noticed that this is going way too slow.
Elsewhere I recommended the Thunderbolt4 cable—it screamed at ~10GBs and didn't need any optimization like tar/compression.
> No, I didn't use compression. Would it be useful over a high-bandwidth connection?
Compression will be useful if you're IO bound as opposed to CPU bound, which at 10MB/s you definitely are.
> --adapt[=min=#,max=#]: zstd will dynamically adapt compression level to perceived I/O conditions.