Sadly, most of the games I play in have monthly sessions at best. Also, players travel from a somewhat greater distance to play. A consequence is that during the month many players misplace their character sheets, or they accidentally leave them at home.
Depending on the game it might be relatively easy to reconstruct the sheet. I'm also trying to force the players to scan in, or otherwise digitize, their sheets, and to store them in an Internet-accessible location such as Google Docs.
Even so, there's always that time when a player shows up ready to roll, but has no sheet. Without the sheet, the experience for everyone will be diminished. It's like putting a big old asterisk on the entire session. I know what precautions to take to avoid it, but how to make it as painless as possible when it does happen?