Universal Cloud Backup
rsync.net
rsync.net
>>> ## price per year for 2 TB:
>>> ## 2000 GB * $0.025 GB/mo * 12 mo
>>> 2000 * 0.025 * 12
600.0
I use rclone (personal backups to Dropbox): a real pain to set up but works well at a fraction of the cost ($16/mo for 2TB = $192/yr).
rclone is glacially slow, however -- I'd much prefer an rsync/rsnapshot option. :-/
Have you tried tweaking the number of transfers, and the transfer chunk size?
ssh user@rsync.net rclone s3:bucket /some/path
What I hope will be interesting and useful is that the ZFS snapshots of the backed up data are immutable and provide a layer of protection against Mallory and her ransomware ...