Backup in OneCare is not a complete backup. It only backs up data files based on your Plan selection. Yes, it is a bit slow in that it searches for files needing to be backed up, then compresses them locally before transferring them to the destination location or burning to disc.
OneCare does not backup Programs, Windows or anything located within \Program Files and \Windows. It also excludes exe files and other program type files from being backed up.
-steve