change formatting

input examples are now given as

```bash
input $ARG1
```

While outputs use md's '> ' sign as a quote.

data/backups/archives.md

@@ -1,26 +1,79 @@
 ---
-title: "archives"
-tags: [ "Documentation", "backups" ]
+title: "Archives"
+tags: [ "Documentation", "tar", "backups" ]
 ---
-# GPG Archives
+# `tar`
 
-Create an encrypted archive with `gpg`:
+## Create
 
-> tar czvpf - file1.txt file2.pdf file3.jpg | gpg --symmetric --cipher-algo aes256 -o myarchive.tar.gz.gpg
+Combine many files and directories into a single t-archive file.
 
-And extract it with `gpg`:
+```bash
+tar cf "$ARCHIVE".tar $DIR
+```
+You can remember this with the mnemonic '*C*reate *F*ile'.
 
-> gpg -d myarchive.tar.gz.gpg | tar xzvf -
+Unfortunately, this stores the full file path, so making a tar archive of `/etc/nginx/` will store `etc/nginx` (without the leading `/`.
+
+It's often better to tell tar which path to start from using the `-C` flag.
+
+```bash
+tar cf "$ARCHIVE".tar -C /etc/ nginx
+```
+
+Check the contents of your archive with:
+
+```bash
+tar tf "$ARCHIVE".tar
+```
+
+If you want to store 'everything in a directory', then using `*` will not work, because it will target everything in the *current* directory.
+
+Instead, you can store the target in a variable:
+
+```bash
+files=$(ls /etc/nginx)
+tar cf "$ARCHIVE".tar -C /etc/nginx/ $file
+```
+
+## Extract
+
+Extract the tar archive with
+
+> tar xf "$ARCHIVE".tar
+
+You can remember this with the mnemonic 'e*X*tract *F*ile'.
+
+## Compress
+
+Create a zip-compressed archive with the `z` flag.
+
+```bash
+tar czf "$ARCHIVE".tgz -C /etc/nginx/ $file
+```
+
+You can use any file ending you want, but sane people like to use '.tgz' or '.tar.tgz'.
 
 # 7zip
 
+(also called 'p7zip' or '7z')
+
 Make archive:
 
-> 7za a -tzip -pPASSWORD -mem=AES256 archive.zip file1 file2
-
+```bash
+PASSWORD=my_password
+```
+```bash
+7za a -tzip -p$PASSWORD -mem=AES256 $ARCHIVE.zip $FILE_1 $FILE_2
+```
 Note that people can still see every filename in your archive, and can change those files.
+They just can't read the contents.
 
 Unzip:
 
-> 7za e archive.zip
+```bash
+7za x archive.zip
+```
 
+7zip will open anything: zip-files, rar-files, a tin of beans, *anything*.
+However, the extracted tgz files will just be tar files, so you will still need to use tar to extract them (see above).