3 Backups.pdf - 06 May 2011 CS 200 System Management Backups CS 200 Spring 2018 1 Backups Lets discuss the facts of life You will die Your disk will die

3 Backups.pdf - 06 May 2011 CS 200 System Management...

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CS 200 CS 200 Spring 2018 Backups 1 System Management Backups 06 May 2011
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CS 200 Spring 2018 Backups Let’s discuss the facts of life... 2 You will die. Your disk will die. Your disk will die first .
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CS 200 Spring 2018 Backups Who does them? The user, manually at day’s end, make copies on ... and, if you’re smart, before you make major changes The user, by running a program, based on time-of-last-modification eg Retrospect, Norton Fastback, SmartBackup Your PC, or a network server, by automatically running an application, based on time-of- last-modification eg Retrospect + Retrospect Client 3
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CS 200 Spring 2018 Backups Terminology (1) A Full Backup Back up everything, whether it’s changed or not Incremental Back up only files changed or created since the last backup Duplicate sets Make n copies of each backup (n > 1) Rotating sets Rotate through n sets of backup tapes/CDs/DVDs/… (n > 1) 4
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CS 200 Spring 2018 Backups Terminology (2) Disk mirroring Replicating the contents (or changed contents, & deleting deleted files) of one disk to another Incremental mirroring Copy changes to a duplicate disk Offsite storage Far enough away as to eliminate the risk of one event destroying both your PC and the backup Archival storage Periodically take a backup set out of service & “archive it” 5
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CS 200 Spring 2018 Backups A Weekly-Cycle Incremental Backup Strategy To recover an individual file work backwards (4, 3, 2, 1, Full) until you find it To restore the entire file system work forwards (Full, 1, 2, 3, 4) restoring everything 6 Monday Tuesday Wednesday Thursday Friday Full Incremental 1 Incremental 2 Incremental 3 Incremental 4 Full Incremental 1 Incremental 2 Incremental 3 Incremental 4 Full Incremental 1 Incremental 2 Incremental 3 Incremental 4 Full Incremental 1 Incremental 2 Incremental 3 Incremental 4 • • • • • • • • • • • • • • •
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CS 200 Spring 2018 Backups More Terminology If you keep a “catalog” of what’s in each backup
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