kopia: add page (#12068)

pages/common/kopia.md

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+# kopia
+
+> Fast, secure open-source backup tool.
+> Supports encryption, compression, deduplication, and incremental snapshots.
+> More information: <https://kopia.io/docs/reference/command-line/>.
+
+- Create a repository in the local filesystem:
+
+`kopia repository create filesystem --path {{path/to/local_repository}}`
+
+- Create a repository on Amazon S3:
+
+`kopia repository create s3 --bucket {{bucket_name}} --access-key {{AWS_access_key_id}} --secret-access-key {{AWS_secret_access_key}}`
+
+- Connect to a repository:
+
+`kopia repository connect {{repository_type}} --path {{path/to/repository}}`
+
+- Create a snapshot of a directory:
+
+`kopia snapshot create {{path/to/directory}}`
+
+- List snapshots:
+
+`kopia snapshot list`
+
+- Restore a snapshot to a specific directory:
+
+`kopia snapshot restore {{snapshot_id}} {{path/to/target_directory}}`
+
+- Create a new policy:
+
+`kopia policy set --global --keep-latest {{number_of_snapshots_to_keep}} --compression {{compression_algorithm}}`
+
+- Ignore a specific file or folder from backups:
+
+`kopia policy set --global --add-ignore {{path/to/file_or_folder}}`