Até onde eu posso ver, algumas das opções disponíveis para você são:
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Gerenciador de objetos :
The db4o Object Manager is a GUI tool to browse and query the contents of any db4o database file. Object Manager currently provides the following features:
- Powerful ad-hoc queries
- Efficient handling of large data sets
- Table view for quick scrolling through large data sets
- Tree view for drilling down through an object graph
- Access to internal database information including stored classes, data size and indexes
- Management functions including Backup and Defragment
DataWander :
DataWander can migrate data from relational database (Oracle 10g XE) to object database (db4).
DataWander can migrate data from object database (db4o) to relational database (Oracle 10g XE) too.
Sistema de replicação db4o (dRS) :
The db4o Replication System (dRS), powered by Hibernate, enables users to build applications that synchronize objects bi-directionally between distributed instances of db4o's leading open source object database and all common relational databases such as Oracle or MySQL. dRS makes db4o's native object persistence architecture available to all Java and .NET developers while staying fully data compatible with existing IT environments using relational database technology.
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Arquivo em lote SqlExport incluído no db4o :
JDBC can be used to backup db4o data and to migrate data between db4o versions with different file formats.
In addition, classes can be generated from existing SQL databases and existing data can be imported into db4o.
Como último recurso, você sempre pode escrever seu próprio código Java para exportar para XML ou qualquer formato que você deseja. Outras consultas relacionadas a isso podem ser postadas no estouro de pilha ou no fórum Versant.