Differential backup strategy backs up only files that have the archive bit set and does not keep them.
There are three different types of backup strategies that can be used to protect your files: full, incremental, and differential.
A differential backup strategy backs up files and folders that have altered since the last full backup, daily. They are much quicker than full backups since less data is being supported up.
A differential backup backs up only the files that modified since the last full back. For example, suppose you do a full stoppage on Sunday. On Monday you back up only the files that modified since Sunday, on Tuesday you back up only the files that changed since Sunday, and so on until the following full backup.
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