I use EaseUS Todo Backup Advanced Server for following reasons.
1) I have ever used its free edition, perfect. And I want to try its advanced Server edition.
2) Its average price, normal backup software for SQL Server backup and restore charges too much.
3) It supports SQL Server 2000/2005/2008
4) I like its wizard, brief and informative
5) Its trial version has successfully restored my database recovery and I decided to buy it.
6) Its free, lifetime and good technical email service leaves me good impression.
Download at http://www.backup-sql-server.com/download.htm