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just backup privkey.der and pubkey.der.
address.txt might be handy too(doesn't mean anything but bismuth doesn't generate the new text file if it has privkey.der and it might be confusing if you launched the wallet at least once, replaced privkey and the old address remains). That's your wallet.dat analog
Thanks!
There should be "BACKUP" button in the wallet.
The very first thing everyone MUST do is creating a safe backup of the wallet.
Is there some swap from test net? i mine some coins early on test net...
No.
The testnet is a complete different chain for testing purpose. Nothing more.
Like a sandbox to play around.