I don't know how many times I've had the conversation, ""If xxxx happens again, please don't hesitate to call us. We'd much rather help you the first time around than try and unravel your mess."" (Okay, not quite in those terms but you get the drift.)
Most recent event, the customer did this exact same thing - updated a sales journal in June that should have posted in May. Since it was early in the morning, it was suggested they restore from last night's backup.
Long story short, their internal ""IT"" guy (and I use that term loosely) calls their network people and six hours later, the restored file cannot be found and they end up doing credits (79) and reinvoicing them manually.
When asked what they should have done differently. I said, ""Please let us work with your network people (we have in the past) so we can get the right files restored correctly. Much easier than having you down for most of the day.