I have a question about solo mining on QT-Client, every time a block is found it ads up in the wallet with a new address.
So do I have to backup the wallet more regulary than with normal transaction ?
It's not a totally NEW address,
it's an unused address taken from your
keypool.
The client creates about a hundred addresses right from the start and keeps those in the
keypool until they are needed/used,
so you don't really have to backup the wallet with each block you found, but more like with every hundred blocks found.
You can set your keypool-size by adding -keypool=<n> in your bitcoin.conf (or terracoin.conf), where <n> is the number of addresses you want (default 100).