Hi,
Backup has changed in the last year. So it is important that the Neo4j db and helm versions are in sync.
The error has
com.neo4j.backuprestore.v2.backup.OnlineBackupExecutor.tryBackup(OnlineBackupExecutor.java:148) [neo4j-backup-5.10.0.jar:5.10.0]
so that looks like 5.10 executable with a 5.25 chart.
That would not be compatible.