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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+ ...
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 full backup of a large data set may take a long time to complete. On multi-tasking or multi-user systems, there may be writes to that data while it is being backed up.This prevents the backup from being atomic and introduces a version skew that may result in data corruption.
Eidetic memory (/ aɪ ˈ d ɛ t ɪ k / eye-DET-ik), also known as photographic memory and total recall, is the ability to recall an image from memory with high precision—at least for a brief period of time—after seeing it only once [1] and without using a mnemonic device.
Plan 9's Fossil file system can provide a similar feature, taking periodic snapshots (often hourly) and making them available in /n/snap. Fossil can forever archive a snapshot into Venti (usually one snapshot each day) and make them available in /n/dump. If multiple changes are made to a file during the interval between snapshots, only the most ...
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]
archive.today (formerly archive.is) is a web archiving website founded in 2012 that saves snapshots on demand, and has support for JavaScript-heavy sites such as Google Maps and Twitter/X. [3] archive.today records two snapshots: one replicates the original webpage including any functional live links; the other is a screenshot of the page. [4]
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.