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TWRP - is DATA backup necessary?

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thethiny
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Default TWRP - is DATA backup necessary?

Hi,
So the official 4.3 ROM UEMK8 was released today for my Note 2 n7100.
I'm currently running UEMK4 4.3, so I thought of backing up everything through TWRP before backing up, as the file I used to flash Odin with (the leaked 4.3) is no longer available as I deleted it by mistake.

so as I'm backing up, everything works but DATA gives me error tarring split files.

so is DATA backup necessary? can't I simply just install the K8 ROM , then if something fails I just wipe my data/cache then restore System and Boot? as I don't need the DATA inside, unless DATA is part of the OS and I MUST have it.

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thethiny
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Conclusion:
No, just perform full wipe.
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