Short answer is Yes,
Long answer is why would you? can you share your use case and what challenges (if any) you've encountered and the reasoning why you want to move to cloud?
From Atlassian's Cloud Data Storage FAQ:
If you need to make an offline backup, check out the following documentation:
Confluence – https://confluence.atlassian.com/confcloud/create-a-site-backup-724765526.html
Jira products – https://confluence.atlassian.com/adminjiracloud/exporting-issues-776636787.html
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After you backup you can download. It presents a link if memory serves.
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