docs/modules/ROOT/pages/explanations/system-requirements.adoc from vshn/k8up

docs/modules/ROOT/pages/explanations/system-requirements.adoc

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= System Requirements

== Supported Kubernetes Versions

K8up (v2 or later) officially only supports recent stable Kubernetes versions.

K8up v1 (not maintained anymore) supports legacy Kubernetes clusters such as OpenShift `3.11` (Kubernetes 1.11).

See the {page-origin-url}[Repository,window=_blank] which upstream Kubernetes version is supported.

== Supported CPU architectures

K8up is only built, tested and supported on Linux.
The only supported CPU architecture is currently _x64_ (otherwise known as _AMD64_ and _x86-64_).

In v2.x, we added Docker images for the _AArch64_ CPU architecture (otherwise known as _arm64_).
These builds are currently provided on a best-effort basis without further testing or support.