Linode
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You are absolutely not going to get several terabytes of data backed up in the cloud for the cost of just having a four terabyte drive sitting in a buddy's machine in the next county over. replication is great, but don't let any possible difficulty you might have with figuring out replication or finding a target keep you from backing up the machine because that's the really important part. For sure. Like even in mind, I have ZFS replicas of stuff. All my really important business stocks also get a copy going up into Tarsnap because if something goes wrong, I really need that subset of the files back. And I want those ones also in the cloud, not just