Overview
Backupdevicesaresometimesreferredtoas"backupdevices"forshort.
Backupdevicescanbedividedinto"hotstandby"and"coldstandby".Hotstandbyreferstoco-operationwiththetargetdevice.Whenthetargetdevicefailsorshutsdown,thehotstandbydeviceimmediatelyassumesthetaskofthefaileddevice;coldstandbymeansthatthecoldstandbydevicestartstobeusedwhenthetargetdevicefailsorshutsdown.Theshutdownwaitingstateentersthestart-upoperationstateandassumesthetaskofmalfunctioningequipment.
Classification
Backupequipmentcanbedividedintosystembackupanddatabackup.
Systembackup
referstothelossofsystemfilescausedbytheuser'soperatingsystemduetodiskdamageordamage,computervirusesorhumanerrordeletion,whichcausesthecomputeroperatingsystemtofailtobootnormallyTherefore,thesystembackupisusedtostoretheoperatingsysteminadvanceforbackupsupportafterafailure.
Databackup
Itmeansthatusersstoredata,includingfiles,databases,applications,etc.,fordatarecovery.Backupisthebasisofdisasterrecovery.Itreferstotheprocessofcopyingallorpartofthedatacollectionfromtheharddiskorarrayoftheapplicationhosttootherstoragemediainordertopreventthesystemfromoperatingerrorsorsystemfailurescausingdataloss.Traditionaldatabackupmainlyusesbuilt-inorexternaltapedrivesforcoldbackup.However,thismethodcanonlypreventman-madefailuressuchasoperatingerrors,anditsrecoverytimeisalsoverylong.Withthecontinuousdevelopmentoftechnologyandthemassiveincreaseofdata,manyenterpriseshavebeguntoadoptnetworkbackup.Networkbackupisgenerallyachievedthroughprofessionaldatastoragemanagementsoftwarecombinedwithcorrespondinghardwareandstoragedevices.