[jeroenhd]

I've never had the conversion corrupt a filesystem for me (plenty of segfaults halfway through, though). It's a neat trick for when you want to convert a filesystem that doesn't have much on it, but I wouldn't use it for anything critical. Better to format the drive and copy files back from a backup, and you probably want that anyway if you're planning on using filesystem features like snapshots.

Windows used to feature a similar tool to transition from FAT32 to NTFS. I'd have the same reservations about that tool, though. Apple also did something like this with an even weirder conversion step (source and target filesystem didn't have the same handling for case sensitivity!) and I've only read one or two articles about people losing data because of it. It can definitely be done safely, if given enough attention, but I don't think anyone cares enough to write a conversion tool with production grade quality.