Yes it’s not the cheapest option, but I think it’s the only one if you need zfs send/receive. But if you don’t need it you can get less than 5TB for cheaper, or just go elsewhere.

You have over 70TB of data you want to backup? That’s a lot. How are you making backups of that for only 99/year?

rsync.net offers ZFS send/receive and I’ve been using it for 5 years now, it’s pretty great. It’s not super expensive per GB, but they ask a minimum of 5TB if you want native ZFS support, which is $60/month.

You get access to a full FreeBSD VM which is very nice, because you can do things like metrics or a “pull” setup that pulls backups from your machines, so you’re more resilient against stuff like ransomware.