Came in to work one Monday to find that the Unix system was borked... on investigation it appeared that a large number of files & folders had gone missing, probably by someone doing an incorrect rm.
Our systems were shared with our US office who supported the UK outside of our core hours (we were in from 7am to ensure trading was ready for 8am, they were available to field staff until 10pm UK time) so we suspected it was one of our US counterparts who had done it, but had no way to prove it.
Rather than try and fix anything, they'd gone through and deleted all logs and history entries so we could never find the evidence we needed!
Restoring the system from a recent backup brought everything back online again, as one would expect!
Biting the hand that feeds IT
