QUOTE(GKWong @ Mar 26 2013, 04:40 PM)
It won't work without SD card I guess...

Even it successfully backup, but it only backup in the phone memory. So when we flash the phone, it will be gone. And I emailed WhatsApp support on this issue, but they wouldn't reply also. Too much ppl complaining them.
Confirm that whatsapp chat history will be wiped clean after re-flash (I did my reflash last night and I backed up everything!) but since Whatsapp only backs up to phone memory (in the case of Lumia 920 anyway), when the phone is re-flashed, everything is wiped clean and the backup is gone.
Luckily my finance program was backed up to Skydrive, other I would be one pissed motherfkr today.
Windows Phone 8 backup/restore system is bloody LAME!, I am still downloading all my apps (Gigabytes of them what with Asphalt and Need for Speed or whatever) and all the system updates (Like the Extra+Info, Network+ etc) have to be updated manually (and they cannot be found in the App Store unless you have the direct link or the CR code which is another FAIL)
I updated because I wanted the Storage Check thing and guess what, it's not there!!! WTF? I suspect it's because I need to update all the system settings first (like the Extra+Info etc etc.) Good god this is bloody painful.
I have done backups and restore of iPhones, iPads etc and everything was done in like 30-45 minutes because iOS devices can be backed up (and I mean every single thing) to the computer.
Microsoft needs to do the same damn thing
Sorry for the rant.