backup host + tweaks

backup/README.md

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+# Generic Backup Host
+
+## Filenames
+
+Container volume backups are of the format:
+
+```
+gitea-data-2023-06-17_050002.tar.gz.enc
+^          ^                ^
+|          |                Backups are encrypted tarballs
+|          |
+|          ISO Datetime separated by _
+|
+Container volume name (*-data)
+```
+
+## Matching
+
+Regex to match backups that are *not* from the first of every month:
+
+```
+.*-data-\d{4}-\d{2}-([^0][0-9]|[0-9][^1])_.*
+```
+

backup/prune.sh

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+#!/usr/bin/bash
+
+# Prunes container data folders monthly on backup host
+# - Regex has been tested and works
+# - Script is not yet tested
+
+ARCHIVES=$(ls | grep -E "[0-9A-Za-z]+-data-\d{4}-\d{2}-([^0][0-9]|[0-9][^1])_.*")
+
+for archive in $ARCHIVES; do
+    if [ -d $archive ]; then
+        echo "Removing $archive"
+        rm -f $archive
+    fi
+done
+