How can I send this coin to another? β You need to know the other userβs T or Z address.
Can t-addr sent coins to z-addr and otherwise? β Yes
Are the coins save in t or z wallet? Is it one wallet or two? β It is one wallet
How can I save the wallet? β The wallet is in file wallet.dat below /home/user/.zcash/testnet3. Do not back it up (with a cp command) while zcashd is running!
Can I send coins in both directions? From t to z and otherwise? β Yes