Backup your files with CrashPlan! Except this file type. No, not that one either. Try again...
Found on The Register on Friday, 24 May 2019
CrashPlan has banned a bunch of file formats from its online backup system aimed at small businesses.
Users on the relevant subreddit claimed CrashPlan had deleted files in the those formats with no warning.
"This is the company that has on its home page 'Automatic Data Loss Protection for Your Small Business' and 'Never worry about losing business-critical data again'. They deleted my business critical data. On purpose."
Another lesson in "never trust the cloud". Either you have control over your critical business data, or you don't; and in the cloud you don't. It's a rough lesson for some, but hopefully a good lesson for many: do your backups right.