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The .ipsw file itself is a compressed archive file (renamed Zip archive) containing at least three Apple Disk Image files with one containing the root file system of the OS and two ram disks for restore and update. tvOS, audioOS and macOS also include a disk image for the recovery environment (recoveryOS).
The iTunes Store was first made available on iOS devices with the release of iPhone OS 2, allowing the purchase of music and podcasts. iPhone OS 3 further added the ability to rent and purchase movies and TV shows from the iTunes Store. As of April 2020, iTunes offers 60 million songs, 2.2 million apps, 25,000 TV shows, and 65,000 films.
Hybrid Online Backup works by storing data to local disk so that the backup can be captured at high speed, and then either the backup software or a D2D2C (Disk to Disk to Cloud) appliance encrypts and transmits data to a service provider. Recent backups are retained locally, to speed data recovery operations.
In the case of iPod file managers, this takes place between an iPod and a computer or vice versa. iTunes is the official iPod managing software, but 3rd parties have created alternatives to work around restrictions in the program, or for those avoiding known issues with iTunes.
iCloud Drive is iCloud's file hosting service, that syncs files across devices running iOS 8, OS X Yosemite (version 10.10), or Windows 7 or later, plus online web app access via iCloud.com. Users can store any kind of file (including photos, videos, documents, music, and other apps' data) in iCloud Drive and access it on any Mac, iPad, iPhone ...
It supports both full system backup and individual files or folders backup. This version provides a "LightsOut Restore" feature, which restores a system from an on-disk software recovery environment similar to Windows RE, thereby allowing recovery without a bootable CD. Upon system startup, a menu asks whether start the operating system or the ...
Site-to-site backup. backup, over the internet, to an offsite location under the user's control. Similar to remote backup except that the owner of the data maintains control of the storage location. Synthetic backup. a restorable backup image that is synthesized on the backup server from a previous full backup and all the incremental backups ...
Grandfather-father-son backup (GFS) is a common rotation scheme for backup media, [1] in which there are three or more backup cycles, such as daily, weekly and monthly. The daily backups are rotated on a 3-months basis using a FIFO system as above. The weekly backups are similarly rotated on a bi-yearly basis, and the monthly backup on a yearly ...