/lib/partman/init.d/95backup is in ubiquity 2.10.16.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh
if [ -d /var/lib/partman/backup ]; then
rm -rf /var/lib/partman/backup
fi
cp -a /var/lib/partman/devices /var/lib/partman/backup
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