How often do you backup wallet.dat?

[SnowRoll]

Periodically (once a week/month/quarter)?
After change in wallet content?

[Ahead]

You only need to bacup once. Or if you create new receiving address inside the same wallet.

[SnowRoll]

You only need to bacup once. Or if you create new receiving address inside the same wallet.

Thanks 

[Drowzy]

If its a wallet for a POS coin and I stake then I back up weekly. If its my BTC or LTC wallet and I use the same address for all transactions then I backup once and keep that backup in 2 different places sometimes 3.

Poster above is correct if you make a new receive address and send something to it you need to backup or you can loose those funds.

[klarki]

It is advisable to make backup after each change.
At least for quick synchronization.

[SnowRoll]

Thanks for your replies. Duly noted.

[nonlinearboy]

I think you should backup when you change your address. And be careful to backup in a safety way.