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# Backups

Hardware is indeterministically reliable.
Software is deterministically unreliable.
People are indeterministically unreliable.
Nature is deterministically reliable.

This chapter explains about why, how, and when to make backups, and how to restore things from backups.

- On the importance of being backed up
- Selecting the backup medium
- Selecting the backup tool
- Simple backups
  - Making backups with `tar`
  - Restoring files with `tar`
- Multilevel backups
- What to back up
- Compressed backups