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Time Machine was overhauled in macOS 11 Big Sur to utilize APFS, Apple's modern file system first introduced in 2016. Specifically, the new version of Time Machine makes use of APFS's snapshot technology. [1] [6] [7] According to Apple, this enables "faster, more compact, and more reliable backups" than were possible previously with HFS+ ...
Most snapshot implementations are efficient and can create snapshots in O(1). In other words, the time and I/O needed to create the snapshot does not increase with the size of the data set; by contrast, the time and I/O required for a direct backup is proportional to the size of the data set.
A reverse incremental backup method starts with a non-image full backup. After the full backup is performed, the system periodically synchronizes the full backup with the live copy, while storing the data necessary to reconstruct older versions. This can either be done using hard links—as Apple Time Machine does, or using binary diffs.
A snapshot is a read-only point-in-time copy of the volume. Snapshots allow the creation of consistent backups of a volume, ensuring that the contents do not change and are not locked while the backup is being made. The core component of shadow copy is the Volume Shadow Copy service, which initiates and oversees the snapshot creation process.
Many version control systems identify the version of a file as a number or letter, called the version number, version, revision number, revision, or revision level. For example, the first version of a file might be version 1. When the file is changed the next version is 2. Each version is associated with a timestamp and the person making the ...
Continuous data protection (CDP), also called continuous backup or real-time backup, refers to backup of computer data by automatically saving a copy of every change made to that data, essentially capturing every version of the data that the user saves. In its true form it allows the user or administrator to restore data to any point in time. [1]
Similar to archive.today, the Wayback Machine takes snapshots of webpages at certain times, as well as user-initiated on-demand archiving called "Save Page Now" (SPN). [2] [3] Wayback and archive.today operate differently, and certain pages can be archived by one but not the other. Wayback is used in over 80% of instances.
Sherlock – file searching (version 2), web services (version 3) Stickies – put Post-It Note-like notes on the desktop; System Settings – default Mac system option application; UUTool – uuencoded/uudecode and other transcoding; Xsan – storage network utility; Yahoo! Widget Engine – JavaScript-based widget system