Comment by igouy

Back in the early '90s, an envelope was delivered to me containing a physical 3.5 inch diskette. The contents was a Smalltalk/V 286 image file. A bug had been found in a program I'd written a couple of years earlier.

The client had saved the program state (including the full dev environment) at the bug (and exported their current data to CSV files, just in case). I stepped into the debugger, fixed the problem, saved the new image file to a 3.5 inch diskette, went to the post office and sent it back to them.

Of course they had continued working but I don't recall which approach they took to merging their new data with the corrected program.

The past is a foreign country …