Your post is not any more urgent than any other post.
I use rsync to backup 3 computers to my server, with a cron job, so that it happens every night whilst I sleep.
Issue "man rsync" and "man crontab" to read about these programs.
This is what my crontab looks like:
#This is to backup silas/mingdao every morning at 1:00 a.m.
#00 1 * * * rsync -va --exclude=WinXP.img --exclude=scratch.img -e "ssh -o BatchMode=yes -o user=root -i /root/.ssh/identity.silas" wired_silas:~mingdao /backup2/silas/
#This is to backup peter/anna every morning at 1:30 a.m.
30 1 * * * rsync -vaz -e "ssh -o BatchMode=yes -o user=root -i /root/.ssh/identity.peter" peter:~anna /backup2/peter/
#This is to backup titus/mingdao every morning at 3:30 a.m.
30 3 * * * rsync -vaz -e "ssh -o BatchMode=yes -o user=root -i /root/.ssh/identity.titus" titus:~mingdao /backup2/titus/