gpg --keyserver hkp://subkeys.pgp.net --recv-key xxxxxxxx
#gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-key xxxxxxxx
#gpg --keyserver hkp://keyserver.kjsl.com:80 --recv-key xxxxxxxx
cat >otrust.txt
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx:6:
^D
gpg --import-ownertrust < otrust.txt
systemd
sudo cp backup.service /etc/systemd/system/
sudo cp backup.timer /etc/systemd/system/
sudo systemctl enable /etc/systemd/system/backup.service
sudo systemctl enable /etc/systemd/system/backup.timer
sudo systemctl start backup.timer
cron
crontab -l
30 1 * * * /home/foo/backup_script/backup.sh