@logfiles,
"
 • If you ever have even any single feeling that your Private keys could have leaked or someone could be having a copy of them. The best thing to do is to sweep your wallet.
 • You can also sweep your private keys if you want to take all your coins to a new address and destroy the paper wallet.
"
What is the difference between sweeping a wallet vs. sweeping private keys?
I checked my Electrum wallet, I only see an option to Sweep private keys.