Catagorized Notes

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blog - generic directory backup script.md

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+# Generic Directory Backup Script
+
+I regularly have directories of files I want to back up in case of disaster. Usually these are files that change often, and I only want to keep recent versions in case I want to revert or recover changes.  (Git?  git, who?)
+
+I have used this script over and over as a simple way to archive a directory to a location with a date-stamped filename.  It also cleans up after itself by deleting files older than X days. I stick it in CRON and let it run on a schedule and I always have an archive of the last X days of the files in my directory.
+
+```bash
+#!/usr/bin/env bash
+#===============================================================================
+#
+#          FILE: wiki-backup.sh
+#        AUTHOR: C Hawley
+#       CREATED: 2022-11-30
+#      REVISION: 2022-11-30
+#
+#===============================================================================
+ 
+set -o nounset                               # Treat unset variables as an error
+ 
+# Backup Source
+bsource=/mnt/data/wiki-data
+ 
+# Backup Destination
+bdest=/mnt/backups
+ 
+# Backup Filename (no extension)
+bfilename=wiki-data-backup 
+ 
+# Get today's date
+bdate=$(date +"%Y-%m-%d")
+ 
+# Archive directory to the destination
+tar czf $bdest/$bfilename-$bdate.tgz $bsource
+ 
+# Prune backups older than 7 days
+find $bdest -maxdepth 1 -type f -iname "$bfilename*.tgz" -mtime +7 -delete
+```
+
+Here's one with a twist - backing up certain things on certain days of the week:
+
+```shell
+#!/usr/bin/env bash
+#===================================================================
+#
+#          FILE: dockerdata-backup.sh
+#         USAGE:  
+#   DESCRIPTION: 
+#       OPTIONS: 
+#  REQUIREMENTS: 
+#         NOTES: 
+#        AUTHOR: C Hawley
+#       CREATED: 2021-04-01
+#      REVISION: 2022-02-02
+#
+#===================================================================
+ 
+set -o nounset                               # Treat unset variables as an error
+ 
+# Get today's date
+bdate=$(date +"%Y-%m-%d")
+day=$(date +%u)
+ 
+# Backup Source
+bsource=/mnt/docker
+ 
+# Backup Destination
+bdest=/mnt/nfs/derry
+ 
+# Backup Every Day
+for dir in gitea npm; do
+    echo "Archiving $bsource/$dir -> $bdest/$dir-$bdate.tgz"
+    tar czf $bdest/$dir-$bdate.tgz $bsource/$dir
+done
+ 
+# Backup only on certain day of week
+case $day in
+    3) #Wednesday 
+      for dir in filerun; do
+        echo "Archiving $bsource/$dir -> $bdest/$dir-$bdate.tgz"
+        tar czf $bdest/$dir-$bdate.tgz $bsource/$dir
+      done
+      ;;
+esac
+ 
+# Prune backups older than 3 days
+find $bdest -type f -iname "*.tgz" -mtime +3 -delete
+```
+
+Change the Backup source, destination and filename variables for your case and the -mtime number to change the retention days.