System Administration. Backups

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System Administration

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Why Backup?

● Problems will occur

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Automate, Automate, Automate

● If it is a hassle to do it, you won't do it

● Let the machine do the boring and repetitive

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Backup Types

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Differential Backups

● Disadvantages:

– The farther you get away from your last full backup,

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Backup hardware

● Tapes, hard drives, DVDs?

● DVDs can store perhaps 48 GB of data

– which is not a lot by today's standards

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Tar

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Tar Usage

● _{tar -cvf <filename> <stuff to back up>}

c create

v be verbose

f create this tar file

● <filename> can be a .tar file, or a tape device ● _{<stuff to back up>} can be individual

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Tar Usage

● What you put in <stuff to back up> determines

how files are restored

● cd /home

tar -cvf filename.tar myhomedir

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Tar Usage

● tar -cvf filename.tar /home/myhomedir

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Tar Usage

● cd /home/myhomedir

tar -cvf filename.tar *

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Seeing what is in a tarball

● tar -tvf file.tar

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Rsync

● Remote SYNC

● Synchronize two directories, potentially over a

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Rsync usage

● _{rsync -av source dest}

a archive (recursion, save permssions, etc) v verbose

● rsync -e ssh -av source

[email protected]:dest

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Rsync Source Specification

● If it does not end in a slash, the directory name is

used

rsync -av source dest

● gives

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Exercises

● Use rsync to back up your home directory to /

tmp/backup as the user linuxed on the

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