Word to the wise. . Before upgrading to ext4 from ext3, make sure you backup your entire sd card to computer and have a recent nandroid. Iwas running classic, wiped cache and dalvik, upgraded to ext4, flashed my ext4 kernel of choice (it was uw8 havs- but im sure it will apply to this kernel as well), rebooted, and most of my apps were gone. Now, i expect that this occured bc i was not installing apps to sd card.
And, you can't revert to ext3 without reformatting the entire sd card. Hence, have sd backed up to computer along with recent nandroid.
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Which recovery are you using?
I upgraded to ext4 via RA recovery, Smelkus mod (4.3), and my sd card had no problems. All storage and ext files remained the same.
But if downgrading I guess yeah backup your files.
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