Update modules/ROOT/pages/backup-restore/online-backup.adoc

Co-authored-by: Nick Giles <[email protected]>

Author: NataliaIvakina

modules/ROOT/pages/backup-restore/online-backup.adoc

@@ -465,10 +465,11 @@ bin/neo4j-admin database backup --to-path=azb://myStorageAccount/myContainer/myD
 [[diff-backup-as-parent]]
 === Perform a differential backup using the `--prefer-diff-as-parent` option
 
-When creating a differential backup, the parent is always the most recent (non-empty) backup in the directory.
-In some cases the directory may have two equally recent backups -- a full backup and a differential one.
-By default, the full backup is chosen as the parent.
-But you can use the differential backup as the parent by setting the option `--prefer-diff-as-parent` to `True`.
+When creating a differential backup, the parent is usually the most recent (non-empty) backup in the directory.
+In some cases you may prefer to use the latest differential backup as the parent, even if there is a more recent full backup.
+You can use the latest differential backup as the parent by setting the option `--prefer-diff-as-parent` to `True`.
+This can be used to ensure you have differential backups for all transactions, which would allow you to restore to any point in time.
+Otherwise, the transactions between a full backup and the previous differential backup will not be backed up as individual transactions.