Restoration

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Restoration
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Focus Question
Compare the ability of various backup/restore
utilities to provide ease of access and secure
storage of your system data.
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Backup/RestoreSystem Utilities

• tar backs up files according to a directory
  hierarchy
• cpio backs up files that match a given set of
  criteria.
• dump/restore performs multi-level backups of
  file systems.

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The TAR Command

• Best used for directory structures within a file
  system.
• Works well with stdin/stdout and various filters.
• Create an archivetar cvf archive.tar dir
  dirssh user_at_hostname tar cf dir gt
  archive.tarssh user_at_hostname tar cf dir
  gzipgpg
• Extract an archivetar xvf archive.tar
  filenamedirnamessh user_at_backuphost cat
  archive.tar tar xvf -

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The CPIO Comamnd

• Primary advantage is that it is a filter which
  can receive input from the find command.
• Create an archivefind cpio vocB O
  devicefilenamefind cpio vocB gzipgpg
  gt backup
• Extract an archivecpio vicdumB I
  devicefilenamezcat archive.cpio.gz cpio
  -vicdumB

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Dump and Restore

• Dump allows incremental backups of entire, single
  file systems
• Restore offers a browsable index of files in the
  archive and the ability to extract all or
  selected files only.
• Examplesssh user_at_hostname dump 1uf - /dev/
  gt archive.dmprestore if archive.dmprestore xf
  archive.dmp

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Review
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Focus Question

• Compare the ability of various backup/restore
  utilities to provide ease of access and secure
  storage of your system data.