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Issue description: 

Application Backup Strategies
This is very confusing.

1. Why are we talking about application level backup tools, like mysqldump and pg_dump, in a course about ODF-Internal and backing up data with csi snapshots or file copy, from the pv ?
2. Please explain why we mention xfsdump, when we only support filesystem based pv's with ext4 ?
3. Why would we make use of "dump" instead of velero's kopia or restic implemnetation, in oadp ?
4. Ceph OSD's make use of LVM, but where does LVM fit in to this ODF course, in regards to PV backup's ? 

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