Are DigitalOcean's nodes/hosts clustered?
Are the hosts or nodes that the droplets (virtual servers) are hosted on clustered or setup for HA or fail over?
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All droplets are hosted on one hypervisor on a RAID disk array and are not replicated automatically. You can however set up HA/fail-over yourself: https://www.digitalocean.com/community/articles/how-to-choose-a-redundancy-plan-to-ensure-high-availability.
Redundancy is a way of reducing the impact of system failures by configuring multiple avenues to achieve the objective. If a disk, a computer, or an entire portion of the network becomes unavailable for some reason, various forms of redundancy can help mitigate the impact on your currently running systems. This will allow you to address the issue without experiencing downtime.