https://github.com/zenhack/dedup-backup

Deduplicating backup utility
https://github.com/zenhack/dedup-backup

backup haskell

Last synced: 16 days ago
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Deduplicating backup utility

• Host: GitHub
• URL: https://github.com/zenhack/dedup-backup
• Owner: zenhack
• License: gpl-3.0
• Created: 2014-08-23T06:15:30.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2018-08-15T04:34:32.000Z (over 6 years ago)
• Last Synced: 2024-10-22T07:03:00.153Z (2 months ago)
• Topics: backup, haskell
• Language: Haskell
• Homepage:
• Size: 69.3 KB
• Stars: 2
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
This is a small tool I use for backups. Highlights:

* Efficiently uses:

  * Disk space - files are de-duplicated using cryptographic hash

    functions (currently sha1, but moving to a more secure hash function

    will not be difficult and is planned).

  * Bandwidth (if backing up to a remote filesystem) - it only copies

    things not already on the backup filesystem.

  * Time - It can make use of modification times and a previous backup

    to speed up incremental backups.

I use it roughly once a week to do full backups of my home directory

(about 500 GiB of data). The amount of additional space used per backup

is negligible.

It assumes a Unix-like system (for the file system semantics). It

therefore will not work on Windows.

# Installation

Via cabal, Haskell's package manager:

    git clone https://github.com/zenhack/dedup-backup

    cd dedup-backup

    cabal install

# Usage

    dedup-backup (-s|--src SOURCE) (-d|--dest DESTINATION)

                 (-b|--blobs BLOB DIR) [--chown] [-p|--prev PREVIOUS]

`SOURCE` is the directory to back up. `DESTINATION` is the location of

the backup. `BLOB DIR` is a directory used to store files by

cryptographic hash; it is used for de-duplication. This directory should

be the same for all backups, and it *must* be on the same partition as

`DESTINATION`.

`PREVIOUS` is an (optional) previous backup of the same `SOURCE` If

specified, the modification times of the files in `PREVIOUS`

and the current version of `SOURCE` will be used to speed up the backup

--- if the modification times are the same the file is assumed to be

unchanged, and will not be hashed.

The `--chown` option tells `dedup-backup` to change the owner and group

on the files in `DESTINATION` to match those in `SOURCE`. Root access

is required for this option.

# License

GPL 3.0 or later.