The TSM client version 5.4.0 supports both Intel-based Macintoshes and PowerPC Macintoshes, provided the operating system level is 10.4.7 and greater.
The installation instructions and installer download information can be found at http://ezbackup.cornell.edu/techsup-v5.4/cu/install/mac/index.html.
Questions and comments can be sent via email to ezbackup@cornell.edu.