I see your OWP and raise you PowerPoint<quoted text>
I know the feeling.
I had a client (another CPA) who used an ancient copy of One Write Plus which he backed up to (shudder) floppies. Older fellow in his 80s and set in his ways.
Recently he had to restore a backup. The restore wrote directly to the live file. It should have written to a temporary file then copied if the restore was successful. Unfortunate, the restore failed in the middle. So he lost it all. Nothing I could do to help him. NOT intelligently designed.
We had a financial reporting system that runs monthly where some of the data was scraped from a PowerPoint presentation that the CFO uses to present to the board.