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docs: document upgrade backup files (#2275)

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* document backup files on upgrade

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* reword TF backup

* Update docs/docs/workflows/upgrade.md

Co-authored-by: Otto Bittner <cobittner@posteo.net>

* Update docs/docs/workflows/upgrade.md

Co-authored-by: Otto Bittner <cobittner@posteo.net>

* Update docs/docs/workflows/upgrade.md

Co-authored-by: Otto Bittner <cobittner@posteo.net>

* Update upgrade.md

Co-authored-by: Thomas Tendyck <51411342+thomasten@users.noreply.github.com>

---------

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>
Co-authored-by: Otto Bittner <cobittner@posteo.net>
Co-authored-by: Thomas Tendyck <51411342+thomasten@users.noreply.github.com>
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docs/docs/workflows/upgrade.md
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@ -58,6 +58,10 @@ Image and Kubernetes upgrades take longer.
For each node in your cluster, a new node has to be created and joined.
The process usually takes up to ten minutes per node.
When applying an upgrade, backup files of Constellation-managed Custom Resource Definitions, Custom Resources, and Terraform state are created.
You can use the Terraform state backup to restore previous resources in case an upgrade misconfigured or erroneously deleted a resource.
You can use the Custom Resource (Definition) backup files to restore Custom Resources and Definitions manually (e.g., via `kubectl apply`) if the automatic migration of those resources fails.
## Check the status
Upgrades are asynchronous operations.