OADP-1791: Added suggestions for the backup types

Author: apurvabhide17

backup_and_restore/application_backup_and_restore/backing_up_and_restoring/backing-up-applications.adoc

@@ -12,13 +12,17 @@ Because all taken backup remains until expired, also check the time to live (TTL
 
 
 You can back up applications by creating a `Backup` custom resource (CR). For more information, see xref:../../../backup_and_restore/application_backup_and_restore/backing_up_and_restoring/oadp-creating-backup-cr.adoc#oadp-creating-backup-cr-doc[Creating a Backup CR].
+The following are the different backup types for a `Backup` CR:
 
 ifdef::openshift-rosa,openshift-rosa-hcp[]
 The `Backup` CR creates backup files for Kubernetes resources and internal images on S3 object storage.
 endif::openshift-rosa,openshift-rosa-hcp[]
 
 ifndef::openshift-rosa,openshift-rosa-hcp[]
 * The `Backup` CR creates backup files for Kubernetes resources and internal images on S3 object storage.
+* For an on-cluster backup, applications and persistent data are fully backed up. This type of backup is fast and can be executed quite often. But the data is vulnerable to cluster or storage outages. You can use CSI volume snapshots.
+* For an off-cluster backup, the Openshift object data and persistent data are backed up and moved from a cluster to ensure that a cluster outage does not impact the backup. This type of backup is slower as compared to a on-cluster backup, and should be executed less often than on-cluster. You can use CSI Data Mover backup and Kopia FSB.
+* Executing a single backup that performs both on-cluster and off-cluster backup is not possible.
 * If your cloud provider has a native snapshot API or supports CSI snapshots, the `Backup` CR backs up persistent volumes (PVs) by creating snapshots. For more information about working with CSI snapshots, see xref:../../../backup_and_restore/application_backup_and_restore/backing_up_and_restoring/oadp-backing-up-pvs-csi-doc.adoc#oadp-backing-up-pvs-csi-doc[Backing up persistent volumes with CSI snapshots].
 
 For more information about CSI volume snapshots, see xref:../../../storage/container_storage_interface/persistent-storage-csi-snapshots.adoc#persistent-storage-csi-snapshots[CSI volume snapshots].