Although all of the above mentioned software are used for the backup purposes yet they are unique in their functionalities and working mechanisms. Discussing one by one:

ACTIVE BACKUP EXPERT:  

The Active Backup Expert (ABE) is such a software used to make a backup of your important files in platform like under Windows 95, 98, ME, NT4, 2000, XP or 2003.  Some of the features of Active Backup expert are:

• It provides us the facility to compress and store the backup and it also support cab file formats.
• It is available in standard and professional edition depending upon the requirements.

ABSOLUTE BACKUP LIMITED:  
                                                           

• It is Windows personal backup software having an interactive GUI.
• It supports backup scheduling and compressing it in the form of zip files.
• It has a simple file restoration mechanism.
• Password Protection is its salient feature.

ADVANCED BACKUP SOFTWARE:                                           

• It supports the backup of your valuable emails.
• It backups your chat software settings like ICQ, MSN, AIM etc.
• It also takes backup of your exiting windows settings.
• Easy recovery mechanism.

EMERGENCY RECOVERY SYSTEM:                                          

• Basically designed and meant for Windows 95, windows 98, and windows ME system files.
• Automated backup support.
• GUI mode of recovery.
• Recover files as folders as well.

 MODES OF DATA BACKUP:

There are three modes of data backup. They are:

• Full Backup                (Full Backup contains all the files which are within the storage media are backed up)
• Incremental Backup  (Only latest changed or altered files are included in incremental backup)
• Differential Backup   (All the files changed since the last full backup taken)
  
  A large number of backup software are available now a days in the market yet all the software mostly posses three above mentioned modes for the backing up of the data.