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Some backup software looks at the date of the file and compares it with the last backup to determine whether the file was changed. Versioning file system: A versioning filesystem tracks all changes to a file. The NILFS versioning filesystem for Linux is an example. [49]
Without the backup file, an unsuccessful write event may truncate a file, meaning it cuts off the file at a position, or leaves a blank file. In practice, this could cause a written document to become incomplete or get lost, a multimedia project file (e.g. from a video editor) to become unparseable, and user preferences being reset to default.
In CP/M, the meaning is inverted: creating or modifying a file clears the archive bit, and the bit is set when the file is backed up. Backup software may provide the option to do a full backup while clearing archive bits – that is, to back up all files regardless of their archive bit status, and to clear the archive bit for all files ...
Copy backup. backs up the selected files, but does not mark the files as backed up (reset the archive bit). This is found in the backup with Windows 2003. Daily backup. incremental backup of files that have changed today. Data salvaging/recovery. the process of recovering data from storage devices when the normal operational methods are impossible.
WBAdmin is a disk-based backup system. It can create a "bare metal" backup used to restore the Windows operating system to similar or dissimilar hardware. The backup file(s) created are primarily in the form of Microsoft's Virtual Hard Disk (.VHD) files with some accompanying .xml configuration files.
It uses the client–server backup model. [1] The product is focused on the small and medium enterprise (SME) market. It performs three types of backup: "A Recycle backup deletes a backup set and adds all files, and a New Media backup creates a new backup set, copying all the files not included. Again this represents all files.
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A backup includes metadata like owner/group, permissions, POSIX ACLs and Extended file attributes. It handles special files also - like hardlinks, symlinks, devices files, etc. Internally it represents the files in an archive as a stream of metadata, similar to tar and unlike tools such as git. The Borg project has created extensive ...