Document a new option --prefer-diff-as-parent (neo4j#2245) (neo4j#2256)

Author: NataliaIvakina

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

@@ -64,14 +64,12 @@ 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>]
-                            [--include-metadata=none|all|users|roles]
-                            [--inspect-path=<path>] [--pagecache=<size>] [--temp-path=<path>]
-                            [--to-path=<path>] [--type=<type>] [--from=<host:port>[,<host:
-                            port>...]]... [<database>...]
+                            [--parallel-recovery[=true|false]] [--additional-config=<file>]
+                            [--include-metadata=none|all|users|roles] [--inspect-path=<path>]
+                            [--pagecache=<size>] [--temp-path=<path>] [--to-path=<path>]
+                            [--type=<type>] [--from=<host:port>[,<host:port>...]]... [<database>...]
 ----
 
 === Description
@@ -162,6 +160,10 @@ 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
+|label:new[Introduced in 2025.04] When performing a differential backup, prefer the latest non-empty differential backup as the 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.
 |