There are basically five types of backups available to you when backing up your PC data: Normal, Differential, Incremental, Copy, and Daily.
A normal backup copies all selected files and marks each file as having been backed up. You usually want to start your backup set with a normal backup. If you always choose normal as your type, then all you need to restore your files is your most current normal backup.
A differential backup copies files created or changed since the last normal or incremental backup. It does not mark files as having been backed up, which means it is more of a cumulative backup. A differential backup can save you some time since you are only backing up new files or files that have been changed since your last normal backup. If you need to restore your files you will need your last normal backup and your last differential backup.
An incremental backup backs up only those files created or changed since the last normal or incremental backup. It marks files as having been backed up, which makes the incremental the quickest of all the backups. However, if you need to restore your files you will need your last normal backup and all incremental backups since the last normal backup.
A copy backup copies all selected files but does not mark each file as having been backed up. Copying can be done between normal and incremental backups since copying does not affect the other backups.
A daily backup copies all selected files that have been modified the day the daily backup is performed. The backed-up files are not marked as having been backed up.
