Comment by broner

Switch your blind faith to Go (s5cmd) and get ~1200 MB/s upload speed!

zfs send tank/pgdata@snapshot | pbzip2 > mybackup.zfs.bz2

s5cmd cp mybackup.zfs.bz2 s3://mygooglebucket/

https://github.com/peak/s5cmd/blob/master/README.md#Benchmar...