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• Once‐a‐daybackups—onlycaptureasinglepointofrecovery
• Increasinglycomplexmanagement(incrementals,differentials,multivendorsolutions,andsoon)
• Questionablereliability
Recovery
Thepointofprotectingdataisensuringthatitisrecoverablewhenneeded.Withtapebackups,however,recovery
canbeatime‐consuming,bottlenecked
processthatmakesitdifficulttogettherightfiletotherightpersonatthe
righttime.Keydrawbackstotaperecoveryinclude:
• Recoverycanbelengthyandcumbersome.
• Onlytrainedadministratorscanrecoverdata.
BackupProcess
1. Afullbackupofeachfileserverisperformed
atascheduledtimeonceaweek.
2. Incrementalbackupsofeachfileserverareperformeddaily,duringoff‐peakhours.
RecoveryProcess
1. Userssubmitafilerestorerequesttoadministrators.
2. Administratorslocatethetape(s);mountit,designatethefilefromthepointofthelastbackup,and
restore
totheuser.
Disk‐BasedBackups
Keybenefits
Disk‐basedbackupsprovideseveralkeybenefitsthatarenotrealizedwithtape.First,backupsaretypicallyfaster
andmoreefficient,whilerecoverytimeimprovessignificantly.Additionally,disktraditionallyprovidesamore
reliableformatfordataprotection.Benefitsinclude:
• Faster,moreefficientbackups
• Morereliablebackups
• Fasterandeasierrecovery
• Possibilitytobackuptotapeforlong‐termarchivalandoffsitestorage
Keydrawbacks
Whiledisk‐basedbackupssignificantlyimprovedataprotectionandrecovery,theystillhavesomedrawbacks:
• Potentialimpactonproductionservers(stillrequireabackupwindow)
• Databacked
uptodisk,possiblyusingtapeemulation(sequentially,butnotcontinuously)
• Databackedupinbackupformat—ITadministrationstillneededforrestores
Recovery