Googling would show that any number of users run into issues with OO/LO file corruption, often from power interruption during saves. The applications seem to handle that in a suboptimal way, and maintainers are unwilling to address it. My suspicion is that their unspoken contention is that the problem is with Windows, not OO/LO.
I recommend backing up to a general file type simply because it's less likely to open in the offending application by default, if the user ever needs to access it.