lk/basics/archives.md

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# Automatic Backups with `find`
> find /home/"$(whoami)" -type f -size -2M | xargs zip -u backup
# Tar Archives
Create ze files:
> tar czf file.tar.gz file1 file2
Extract ze files:
> tar xzf file.tar.gz
The .tar extension means two or more files are bundled together into a single file. The .tar.gz means compression.
Tarballs come with a number of arguments.
- c means 'create'.
- v means 'verbose'.
- f means 'this is the file' and must always be the ultimate argument.
- z means compression.
So we can compress file1 and file2 into a single tar called 'archive' with:
> tar czvf archive.tar.gz file1 file2
Extraction uses 'x' instead of 'c'.
> tar xzvf archive.tar.gz
Create a very compressed file:
> tar cfj super-compressed.tar.gz file1 file2
# Example - Compressing all Latex Files in /home/
> sudo find ~ -maxdepth 4 -name "*.txt" | xargs tar cvf latex-bundle.tar.gz
# ssh backup
Back up an unmounted partition with ssh:
> sudo dd if=/dev/sda1 | ssh -C ghost@192.168.0.10 "dd of=/home/ghost/backup.img" status=progress
# img.xz
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Install `xz`.
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Unzip the image with:
> unxz void.img.xz
This then deletes the .xz file. To keep it:
> unxz --keep void.img.xz