AS-Java (EP-BI-Java) brtools backup vs Export for restoration purpose

May seem a novice question but would like to have input on whether an offline Oracle backup of a Java SAP instance is sufficient for safe restoration. We are using SAP Export of the instances currently for the purpose of keeping system backups. Should a complete backup of system not be sufficient instead of taking exports of system.

Does backup of system skips or misses any java configurations ?

Thanks.