Below is a list of some competitors
BackupChain Backup Software
12-Backup
Acronis
Argentum Backup
Back4Win
Genie
NTI Backup Now
BackUpTime
Careful Backup
GRBackPro
NovaBackup
2BrightSparks
StorageCraft
GFI
PHD Virtual Technologies
Veeam
BackupAssist
Appassure