Local (or external) SVN repository cannot be configured with OnDemand. However, you can import your local SVN data to OnDemand, see http://confluence.atlassian.com/display/AOD/Importing+Versioned+Data+into+Subversion
Just for the record, here is a related feature request - https://studio.atlassian.com/browse/JST-710
Hello Community! We thoroughly enjoyed this just-for-fun conversation in the Jira Admin Group about what it's like to be a Jira Admin. For #JiraJuly, our talented designers created these graphics t...
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