Back burns are fires deliberately lit to clear dry undergrowth.
"Even if we bring in an extra 1,000 firefighters, we still don't have enough trucks and firefighters for every single home in New South Wales", New South Wales Rural Fire Service Inspector Ben Shepherd told Sky News.
"A fresh burst of hot, dry westerly winds will result in severe fire dangers in the Darling Downs and Granite Belt", the Bureau of Meteorology flagged for the border region between the states of Queensland and New South Wales.
The fire service said there were 61 fires still burning across the state, 35 of which were not contained.
"We're doing what we can for our fellow Aussies while still maintaining resources on the home front, which have been much needed in the past few days", the Western Australia Department of Fire and Emergency Services said on social media.
The national death toll from the fires had risen to four.
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A few hours later, Aaron's twin sister Angel also filed documents for a domestic violence restraining order against her brother. Nick even hired security to protect his then-pregnant wife, Lauren from Aaron after he allegedly threatened to kill them.
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But Morrison says Eisenberg later told him that he did not intend for the call summary to be placed on a highly classified server. Director of the National Economic Council Larry Kudlow speaks to the media at the White House in Washington on September 6, 2019.
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In Queensland, QFES said most of the state will experience high and very high conditions this weekend, with the Granite Belt and Darling Downs expected to reach severe today and extreme tomorrow.
A 51-year-old man was charged after allegedly lighting a fire northeast of the New South Wales city of Armidale in a back-burning attempt to protect a cannabis crop.
The RFS said more than 250 homes have been destroyed, nearly 90 homes have been damaged, and some 480 outbuildings and 18 facilities have also been razed.
The four people killed in the past week are Barry Parsons 58, at Willawarrin, near Kempsey, Julie Fletcher, 63, who died in the town of Johns River, and Wytaliba locals Vivian Chaplain, 69, and George Nole.
An air tanker drops fire retardant on the Gospers Mountain fire near Colo Heights, New South Wales (NSW), Australia, 15 November 2019.
In Queensland, there were several major fires on Saturday still of concern and gusty winds were expected on Sunday, worsening conditions after 16 homes were destroyed in the past week.