There are three types of backups.
1, Full backup.
This is a complete copy of everything that you wish to back up. It will take up an equivalent amount of space as the original files. Full backups are very convenient due to easy of restoration after data loss. It is easy to match the lost data with the back up one.
2, Incremental backup
In this set up you only store the changes and files since the last backup, whether full or incremental backup. The advantage is that you are not taking up much space save quite a bit of space since you aren't storing many copies of the exact same files, and they are much quicker to process during the backup. The downside is that you'll need the last full backup plus every incremental backup you made since then in order to restore the files. So restoration is more painful.
3, Differential backup.
It is a compromise between full and incremental backups. It only stores all files that have changed since the last full backup, ignoring any previous differential or incremental backups. That makes restoration much quicker than with multiple incremental backups.
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