Just looked at the features in Second Copy (I have version 7), I am using second copy at home, Cobian Backup at work. After comparing features,
Cobian Backup will do more than Second copy and as stated is Freeware. Cobian backup can also copy multiple versions of a file, so, for example you can keep the last 2, or 5 even 10 versions if the file has been edited useful. It can also archive to an outgoing email address or upload the archive to an FTP site.