This was necessary in times where wallets pregenerated a fix amount of addresses. At this time you had to back your wallet.dat up every time a bunch of new addresses have been generated.
Most of the wallets now (including electrum) are using Hierarchical Deterministic (HD) wallets (https://en.bitcoin.it/wiki/Deterministic_wallet).
This means your 12 word seed (which you were prompted to write down at the initialisation of your wallet) is used to create private-/public- keypairs.
You can think of it as a mathematical equation: newAddress = mathFunctionOn(seed) + counter.
So backing up your 12 word seed phrase once is enough to be able to restore your coins into any BIP39 compatible wallet.
Topic: Electrum backup (Read 214 times)
There is no need to do that. You just need to make sure you have safely stored the seed phrase so you can use it to recover.
Should I backup the wallet file everytime I make a new transaction?
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