This has only been tested on backing up an ext4 partition to an ext3 external drive.
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Clone this repo onto your external drive.
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Run slackbackup setup.
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Run whatever is needed here:
slackbackup add /path/to/directory
slackbackup exclude /path/to/directory
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Mount drive
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Run slackbackup backup
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Install needed packages from packages directory.
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Copy backup from machines