Add README to sys backup
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This one backs up the
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[Alpine Local Backup](https://wiki.alpinelinux.org/wiki/Alpine_local_backup)
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to my big storage array.
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My system runs from a RAM disk,
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which means whenever it reboots,
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it loses any changes I've made.
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Alpine Local Backup is a mechanism for stashing these changes away to persistent storage.
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The backups Alpine makes are compressed tarballs.
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`tar xzf backup.tar.gz` will restore everything it's saved.
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