I want to backup my confluence site, and I use the HSQL Database Engine . Do I need to backup this DB ?
And if I want to restor this site, do I need to resotr the DB firstly, then resotre the xml file?
Yes. You can use the existing backup functionality in the administration screen to back up your instance (https://confluence.atlassian.com/display/DOC/Site+Backup+and+Restore).
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