Backup files to usb thumb - runlevel 3
 

I need to back up files to a usb thumb from runlevel 3 but i have trouble locating the usb device from runlevel 3. Help?

The USB device is likely to be at /dev/sda1, /dev/sda2, /dev/sdb1, or similar -- J.W.

Yes it is /dev/sdb. When I try to cd into it, it says "Directory doesn't exist". and when i just enter /dev/sdb , it says permission denied. It is NOT write protected. How can i cd into it?

You need to mount the device to a mountpoint first, not try to just cd into it.
If you do not already have a mountpoint (eg, a directory) defined, then you'll need to create one first
Note that /mnt/usb_drive is just an example, you can call it whatever you want. Once it's mounted, then you can "cd /mnt/usb_drive" and you should be able to see your data. -- J.W.