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Yes, AKS (Azure Kubernetes Service) cluster can be backed up using several methods.

1. Azure Backup: Azure Backup is a cloud-based backup solution that enables you to protect your AKS cluster by taking snapshots of it. This method is easy to configure and provides automatic backups.

2. Velero: Velero (formerly Heptio Ark) is an open-source tool that you can use to back up and restore Kubernetes clusters, including AKS clusters. Velero creates backups of the cluster's data, configuration, and metadata, and it saves them to a cloud-based storage system.

3. Custom Script: You can create a custom script that can backup your AKS cluster by taking snapshots of your cluster's configurations and data. This requires manual intervention, but it grants you greater flexibility in terms of storage options.

Regardless of the backup method you choose, it is important to regularly back up your AKS cluster to prevent data loss in case of issues.