crontab -e

5 * * * * cd /var/www/html/backup && sh clear_ram.sh

#!/bin/sh

echo 1 > /proc/sys/vm/drop_caches
echo 2 > /proc/sys/vm/drop_caches
echo 3 > /proc/sys/vm/drop_caches

#!/bin/sh

dd if=/dev/zero of=/swap bs=1M count=1024
mkswap /swap
swapon /swap

#!/bin/sh

ssh root@project.ru «tar zcvf — /var/www/project» | cat > /tmp/project.tar.gz