With a followed account, in transfer it is clearly wrote : Not your account and I can unfollow it. This is not the case with mines.
I can't understand there is no way to textually backup my private keys,.
Edit : solved
Thanks a lot well.attenuated, this is exactly what I was looking for.
The option to export a private key is still missing, but it's planned to add it. In the meantime, you can do this:
In the javascript console of your browser type, when the wallet is unlocked
WalletDb.getPrivateKey(PublicKey.fromPublicKeyString("BTS...")).toWif()
Where BTS is your owner public key. This can be imported into the CLI wallet or another web wallet.
Edit: Credit to mindphlux for this post