You can try Structure plugin, which can aggregate estimates upwards in the hierarchy - but you'll need to create a "meta-issue" representing the total, and then add all issues from the backlog under that "total" issue as sub-issues (you can use the same JQL condition as advised by Mathias).
In this way you can also have totals per-epic.
Disclosure: I'm working for the company behind Structure
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
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