Is it safe to restore a wallet.dat into a fully loaded block chains by using -rescan option
Lets say I have two wallet, one for my savings and the other for day to day transactions.
I only used my savings wallet once for the creation, then I made a backup of it.
Now couple weeks or months later I want to restore it and buy some stuff.
Can I just place it in %appdata% where the block chains is already downloaded?
Yes. Just make sure not to overwrite the other wallet and lose it!