/etc/cron.daily/passwd is in passwd 1:4.1.4.2+svn3283-3ubuntu5.
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 8 9 | #!/bin/sh
cd /var/backups || exit 0
for FILE in passwd group shadow gshadow; do
test -f /etc/$FILE || continue
cmp -s $FILE.bak /etc/$FILE && continue
cp -p /etc/$FILE $FILE.bak && chmod 600 $FILE.bak
done
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