Thanks, elkay14 for this note. I have turned the unRAID setting "Share security" from "Simple" to "User level", create non-guest account, reinstall tminstall.sh and create new timemachine backup to disk share (/mnt/disk2/TM) using non-guest login. After that I have restored entire volume "Macintosh HD" successfully using same non-guest login. MacOS X 10.7.4, unRAID Plus.