My phone can't start after backup failed I tried backing up my Galaxy S4 using this method:
http://galaxys4root.com/galaxy-s4-tutorials/how-to-backuprestore-rom-on-galaxy-s4-with-root-cwm-recovery/


1st backup failed but I could still boot the phone
When backing up, it failed halfway, it failed backing up /data/.
I rebooted my phone and found that my keyboard doesn't remember my custom words anymore.
2nd backup failed and I can't start the phone anymore
I rebooted into the recovery and tried backing it up again the second time.It failed halfway, it failed backing up /system/.Then I tried the backup again (without rebooting) and it failed immediately saying no space on the SD card (I am not sure if it's true)


So I rebooted the phone and it is showing the boot animation forever (I waited over 30 mins).

I tried restoring /system/ from the first backup but it didn't help.

I don't even know where the problem is, how can a backup break your phone??Any help will be appreciated.
I finally did a Wipe/Factory reset. I lost all apps and data, but at least I can use my phone again.

And yes, that was because I ran out of space in the internal SD card.