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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. 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. 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 ## Check the status
Upgrades are asynchronous operations. Upgrades are asynchronous operations.