System backup Disk image
some backup programs user files; boot information , files locked operating system, such in use @ time of backup, may not saved on operating systems. disk image contains files, faithfully replicating data. reason, used backing cds , dvds. files don t belong installed programs can backed file-based backup software, , preferred because file-based backup saves more time or space because never copy unused space (as bit-identical image does), capable of incremental backups, , have more flexibility. files of installed programs, file-based backup solutions may fail reproduce necessary characteristics, particularly windows systems. example, in windows registry keys use short filenames, not reproduced file-based backup, commercial software uses copy protection cause problems if file moved different disk sector, , file-based backups not reproduce metadata such security attributes. creating bit-identical disk image 1 way ensure system backup original. bit-identical images can made in linux dd, ava...