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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.
Version 1.0 1995; [81] Developed by StarBase software, acquired by Borland(which was acquired by Micro Focus). Apache Subversion: Started in 2000 by CVS developers with goal of replacing CVS Synergy: Developed beginning in 1988 by Caseware, as AmplifyControl. The company was renamed Continuus in 1994, where the product became better known as ...
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Apple File System was announced at Apple's developers’ conference (WWDC) in June 2016 as a replacement for HFS+, which had been in use since 1998. [11] [12] APFS was released for 64-bit iOS devices on March 27, 2017, with the release of iOS 10.3, and for macOS devices on September 25, 2017, with the release of macOS 10.13.
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 ...
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 ...