Backblaze, a cloud backup service, has stopped backing up certain folders, including OneDrive and Dropbox, without notifying its users. This change was made quietly, with the only mention of it being in the release notes under 'Improvements'. The author of the article is upset about this change, as they had been using Backblaze for years and had recommended it to others. The author argues that this change goes against the principle of backing up all user data, which was a key feature of Backblaze's service.