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I used nautilus to move files from one partition (ext4) to another (ext4). Some time later, and im not sure exactly how much, maybe a weak or two, i need these files, but they are all became empty (zero size), all data lost, just the file names. I googled this issue and i found this article saying that this is because of poorly written applications in which they did not consider the ext4's delayed allocation feature.

Fedora 30 (32bit)
Nautilus - Files 3.32.3-stable

p.s. the article https://thunk.org/tytso/blog/2009/03/12/delayed-allocation-and-the-zero-length-file-problem/