Can't get automatic backup working

Hello, I have been trying to get an automatic backup script working with cronjob but I just can't get it to work.
I am using centos.

I don't think it's the script itself cause nothing shows or happens.
Here it is anyways:
http://pastebin.com/34buBt6Q

I noticed I can't do 'screen -r minecraft', even though I made the screen 'minecraft'
this is what it shows for the screen, is it suppose to be like that?

Code:

    There is a screen on:
26182.minecraft(Attached)
There is no screen to be resumed matching minecraft.

Cron
It shows when I do crontab -l

Code:

20 1 * * * /root/server/autobackup.sh 1>/dev/null 2>/dev/null

Any help?

bump

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Hu?!
This is a random way of doing backups...
get a plugin?!

 

Hu!?
No thanks I rather not lol

 

You can't use a CRON tab by itself to perform a safe backup while the server is running. This would only work on cold files that are not being used by a server. Running this script can and will cause a corrupt backup.

Does the script work when you run it manually?