I used to process accounts for vendors who delivered to "Key Customers". They would upload the data onto a server in Sydney Australia and I would access this in Brisbane, check the info then compile all accounts into one file for Central Billing for the state. I also monitored who had not sent in their data, contact them to see if there was a problem and talk them through it if possible.
One day a vendor in Sydney had a dead modem so I told him how to copy the file onto a floppy, take it to a friend who had email and get him to email it to me direct. This approach usually worked. However in this case his file did not arrive within a rreasonable time so I asked him to do it again and success. This was in March.
The next June a file arrived in my email from the same person. Querying this proved to be the file originally sent first in March. I asked the telephone company what happened and was told that files sometimes get lost in the server!
The originator could have walked with the disk in his hand and got to me faster.
This one tip will help you sleep better tonight
A few seconds are all you need to get a better night's rest.