As i couldnt get any satisfying answer to my Question it seems we have to write our own program for that, we are in the design phase and we are thinking which format shall w
You could give Toad (Quest Software) a try.
It supports all your mentioned platforms and can do things like 'Export table data to INSERT statements' on your source platform which can then be run on the target platform. IIRC there is even some Toad-internal backup-format which might be cross-platform.
Toad Communities:
Some videos about exporting, importing: