The folks at cloud-backup service Backblaze discovered a troubling behavior in Adobe Creative Cloud: an update to Adobe’s Mac software was deleting the contents of the first hidden folder it saw, in alphabetical order, at the root of users’ disks. (Hidden folders aren’t displayed in the Finder, but often contain important settings or other data.) Backblaze users noticed the bug because the Backblaze app depends on a hidden folder called .bzvol, which is often alphabetically the first hidden folder on Backblaze users’ drives. For other Mac users, the first folder would likely have been .DocumentRevisions-V100, which stores data required for OS X’s Auto Save and Versions features — deleting that data could be problematic. Adobe acknowledged the bug and replaced the update quickly, so make sure to let Creative Cloud update itself.