You have mentioned the following:
"the progress meter stops and Conf becomes unreachable"
Considering the affimartion above as a fact, I believe you could be running out of the memory, when you're trying to export, which it could be normal as this process requires a lot of JVM memory. Being that said, you may want to follow the steps from the following documentation in our order to increase the JVM memory:
I hope this helps.
We've found that the most reliable way to export is to do a database dump and avoid Confluence's export altogether. Of course, this is for backup/restore. One thing you can do is uncheck the option to include attachments. Attachments (and their versions) can take up a large amount of space.
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