Cloud only accepts exports from Confluence 5.something and above (I can't remember the exact number). In fact, I've seen some simple Confluence exports from version 4 go straight into the Cloud, but it's not supported and hence not recommended. It is very strongly recommended that you get on to "latest" before you migrate.
There is no chance of importing from 3.3. The storage of the content is totally different in version 4, and you'll need to upgrade from 3 to 4 to get it converted to something Cloud might be able to read.
Hi @Valentin Smoliy ,
there are a couple options, I guess it depends on how many pages and spaces need to be moved. If you only have a few pages (less than 100) the easiest way is probably to manually copy each page.
If you have lots of pages/spaces however, you could first upgrade the Confluence instance to 7.x version and then use the Confluence Cloud Migration assistant : https://support.atlassian.com/migration/docs/confluence-cloud-migration-assistant/
There are also API that you can use to automate this process. You can find more information here :
Let me know if this helps,
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