Document --prefer-diff-as-parent

Author: NataliaIvakina

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

@@ -64,7 +64,7 @@ For more information, see xref:backup-restore/online-backup.adoc#online-backup-c
 
 [source,role=noheader]
 ----
-neo4j-admin database backup [-h] [--expand-commands] [--verbose]
+neo4j-admin database backup [-h] [--expand-commands] [--prefer-diff-as-parent] [--verbose]
                             [--compress[=true|false]] [--keep-failed[=true|false]]
                             [--parallel-recovery[=true|false]]
                             [--additional-config=<file>]
@@ -162,6 +162,10 @@ It is recommended to use `SHOW USERS`, `SHOW ROLES`, and `SHOW ROLE $role PRIVIL
 Note: this is an EXPERIMENTAL option. Consult Neo4j support before use.
 |false
 
+|--prefer-diff-as-parent
+|When performing a differential backup, prefer the latest not-empty differential backup as parent instead of the latest full backup.
+|false
+
 |--temp-path=<path>
 |Provide a path to a temporary empty directory for storing backup files until the command is completed. The files will be deleted once the command is finished.
 |