Security is always a good concern to have, you should never become complacent with security. With this said, Atlassian does take security and privacy very serious. We have a rather extensive document which walks though how Atlassian does security (to include cloud). You may find this document at Security Practices.
Along with this, Atlassian does have a bug bounty program to ensure our products stay safe and secure. You may find more about the bug bounty at https://bugcrowd.com/atlassian.
I hope this helps you to find further information how security is handled along with answering how secure your data will be.
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