I made a backup of my stock ND3 Android 4.4.2 while helping someone restore their stock ROM. I know ND3 stock firmware isn't available yet (and perhaps never) but if you ever need to go back to stock and didn't make a backup, you can use this to get stock firmware back. You probably don't need this since you can use NCE ROM but just in case.
This does not include any bootloader/modem/etc, just system and data but should be enough to get you back on track.
http://stockroms.net/file/GalaxyS5/SM-G900A/SafeStrapBackup/4.4.2/KOT49H.G900AUCU2AND3.zip
Unzip and put under /TWRP/BACKUPS/blahblah directory.
If you don't have blahblah directory, just make backup of your current cache and will create one.
You can also follow this video if you just don't get it:
This does not include any bootloader/modem/etc, just system and data but should be enough to get you back on track.
http://stockroms.net/file/GalaxyS5/SM-G900A/SafeStrapBackup/4.4.2/KOT49H.G900AUCU2AND3.zip
Unzip and put under /TWRP/BACKUPS/blahblah directory.
If you don't have blahblah directory, just make backup of your current cache and will create one.
You can also follow this video if you just don't get it:
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