I just did a factory reset on my year old Kobo Glo HD, before I installed 3.19.whateverthereleasenumberwas.
The reason I did a factory reset was to trim down the internal database.
It had gotten to be over 3,000 rows of book content info. Since I keep track of book reading in a real database, I really don't need to retain history on the device. And since I generally only keep minimal ebooks on the device, going through the reload process is not onerous.
I also backup the non-ebook sections of the device, so I have the cluttered databases (and their associated history) if I need them.
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