Bug#993947: Time lost, /etc/systemd/timesyncd.conf gets replaced with a default one

[Santiago Garcia Mantinan]

Hi again!

I have just migrated another machine and I found out that it worked out
well.

The thing is exactly what you have descrived, here the order was (luckily)
the right one, so when systemd-timesyncd is configured, systemd had already
created the dpkg-bak file like we can see here:

Configurando systemd (247.3-6) ...M
Instalando una nueva versión del fichero de configuración /etc/systemd/journald.conf ...M
Instalando una nueva versión del fichero de configuración /etc/systemd/logind.conf ...M
Instalando una nueva versión del fichero de configuración /etc/systemd/networkd.conf ...M
Instalando una nueva versión del fichero de configuración /etc/systemd/resolved.conf ...M
Instalando una nueva versión del fichero de configuración /etc/systemd/system.conf ...M
Instalando una nueva versión del fichero de configuración /etc/systemd/user.conf ...M
Created symlink /etc/systemd/system/sysinit.target.wants/systemd-pstore.service → /lib/systemd/system/systemd-pstore.service.M
Removing obsolete conffile /etc/dhcp/dhclient-exit-hooks.d/timesyncd ...M
Obsolete conffile /etc/systemd/timesyncd.conf has been modified by you.M
Saving as /etc/systemd/timesyncd.conf.dpkg-bak ...M
Removing obsolete conffile /etc/pam.d/systemd-user ...M
Configurando libmono-system-core4.0-cil (6.8.0.105+dfsg-3.2) ...M
Configurando systemd-timesyncd (247.3-6) ...M
Created symlink /etc/systemd/system/dbus-org.freedesktop.timesync1.service → /lib/systemd/system/systemd-timesyncd.service.M
Created symlink /etc/systemd/system/sysinit.target.wants/systemd-timesyncd.service → /lib/systemd/system/systemd-timesyncd.service.M
Configurando libmono-system-security4.0-cil (6.8.0.105+dfsg-3.2) ...M

Regards...
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