Backup Archive Bit

Backup refers to making copies of data so that these additional copies may be used to restore the original after a data loss event. Backup Data

But how does the backup utility knows which files to backup??!!

One of the files properties is The Archive Bit.The archive bit is a binary bit.Either 1 or 0, it is also called set (1) and clear or reset (0).Backup Archive Bit

What does this bit represents?!If it has been set to (0) it represents that the file has been backed up.And (1) represents that the file has been modified since the last backup.

How does it work?!When the backup operation is done, it looks for files with the (1) archive bit.Once the file is backed up, it will be reset to (0).This type of backup is called.. An incremental backup.

Backup MethodsThese backup methods can affect the archive bit:Full Backup : reset archive bitDifferential Backup : does not reset archive bitIncremental Backup : reset archive bit

Full Backup : reset archive bit

Differential Backup : does not reset archive bit

Incremental Backup : reset archive bit

Attrib CommandThe archive bit can be seen or changed with the attribcommand-line utility.

Syntax:ATTRIB [d:][path]filename [/S]ATTRIB [+ R|-R] [+A|-A] [+ H|-H] [+ S|-S] [d:][path]filename [/S]