diff --git a/bashup-backup-files.sh b/bashup-backup-files.sh
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+#!/bin/bash
+#
+# Bashup - A set of bash scripts for managing backups.
+# https://git.stack-source.com/msb/bashup
+# MIT License Copyright (c) 2021 Matthew Saunders Brown
+
+# retention vars
+retention_years=0;
+retention_months=3;
+retention_weeks=5;
+retention_days=7;
+# backup storage directory
+backup_storage_dir='/mnt/backups';
+# directories to be backed up
+backup_dirs=('/etc' '/home' '/srv' '/root' '/usr/local' '/var/www');
+
+# check for local config, which can be used to override any of the above
+if [[ -f /usr/local/etc/bashup.cnf ]]; then
+  source /usr/local/etc/bashup.cnf
+fi
+
+if [ ! -d $backup_storage_dir ]; then
+  echo "ERROR: Backup storage dir ($backup_storage_dir) does not exist."
+  exit 1
+fi
+
+# check if backup_storage_dir is a mount in fstab
+grep -qs " $backup_storage_dir " /etc/fstab
+if [ $? -eq 0 ]; then
+  # check if backup_storage_dir is already mounted
+  grep -qs " $backup_storage_dir " /proc/mounts
+  if [ $? -ne 0 ]; then
+    # attempt to mount backups
+    mount $backup_storage_dir
+    # re-check for backups mount
+    grep -qs " $backup_storage_dir " /proc/mounts
+    if [ $? -ne 0 ]; then
+      echo "ERROR: failed to mount $backup_storage_dir"
+      exit 1
+    fi
+  fi
+fi
+
+# set more vars based on above settings
+today=$(date +%Y%m%d)
+existing_backups=($(ls $backup_storage_dir|grep -v lost+found))
+# remove today from existing backups, if it exists. we do other checks later to avoid re-doing backups
+if [[ " ${existing_backups[@]} " =~ " ${today} " ]]; then
+  unset 'existing_backups[-1]';
+fi
+
+# create retention array
+declare -a retention_array
+
+# set retention days
+if [ $retention_days -gt 0 ]; then
+  i="0"
+  while [ $i -lt $retention_days ]; do
+    DATE=`date --date="$i day ago" +%Y%m%d`
+    retention_array[$DATE]="$DATE"
+    i=$[$i+1]
+  done
+fi
+
+# set retention weeks
+if [ $retention_weeks -gt 0 ]; then
+  i="0"
+  while [ $i -lt $retention_weeks ]; do
+    i=$[$i+1]
+    DATE=`date --date="sunday - $i week" +%Y%m%d`
+    retention_array[$DATE]="$DATE"
+  done
+fi
+
+# set retention months
+if [ $retention_months -gt 0 ]; then
+  i="0"
+  while [ $i -lt $retention_months ]; do
+    DATE=`date --date="$i month ago" +%Y%m01`
+    retention_array[$DATE]="$DATE"
+    i=$[$i+1]
+  done
+fi
+
+# set retention years
+if [ $retention_years -gt 0 ]; then
+  i="0"
+  while [ $i -lt $retention_years ]; do
+    DATE=`date --date="$i year ago" +%Y0101`
+    retention_array[$DATE]="$DATE"
+    i=$[$i+1]
+  done
+fi
+
+# create backup for today
+if [[ " ${retention_array[@]} " =~ " ${today} " ]]; then
+
+  # create backup (date) dir if it doesn't already exist
+  if [[ ! -d "$backup_storage_dir/$today" ]]; then
+
+    mkdir $backup_storage_dir/$today
+
+  fi
+
+  # only proceed if files have not already been backed up
+  if [[ ! -d "$backup_storage_dir/$today/files" ]]; then
+
+    # create files backup dir
+    mkdir $backup_storage_dir/$today/files
+
+    for dir in "${backup_dirs[@]}"; do
+
+      #only proceed if source dir exits
+      if [[ -d $dir ]]; then
+
+        # only proceed if dir has not already been backed up
+        if [[ ! -d $backup_storage_dir/$today/files$dir ]]; then
+
+          # check if existing_backups is not empty, and if so if the dir to back up exists in the previous backup
+          if [[ ${existing_backups[@]} && -d $backup_storage_dir/${existing_backups[-1]}/files$dir ]]; then
+
+            # make parent destination dir, if it doesn't exist
+            if [[ ! -d $backup_storage_dir/$today/files`dirname $dir` ]]; then
+
+              mkdir -p $backup_storage_dir/$today/files`dirname $dir`
+
+            fi
+
+            # create a hard-link copy of the backup before doing rsync
+            cp --archive --link $backup_storage_dir/${existing_backups[-1]}/files$dir $backup_storage_dir/$today/files$dir
+
+          fi
+
+          # backup up files with rsync, updating existing hard link copy if it exists
+          rsync --relative --archive --numeric-ids --one-file-system --delete $dir $backup_storage_dir/$today/files
+
+        fi
+
+      else
+
+        echo "NOTICE: Dir $dir does not exist, can not perform backup."
+
+      fi
+
+    done
+
+  fi
+
+fi
+
+# remove expired backups
+for existing_backup in "${existing_backups[@]}"; do
+
+  if [[ " ${retention_array[@]} " =~ " ${existing_backup} " ]]; then
+
+    # keep $existing_backup, do nothing
+    one=1;
+
+  else
+
+    if [[ -d $backup_storage_dir/$existing_backup/files ]]; then
+
+      rm -r $backup_storage_dir/$existing_backup/files
+
+    fi
+
+    if [[ -z "$(ls -A $backup_storage_dir/$existing_backup)" ]]; then
+
+      rm -r $backup_storage_dir/$existing_backup
+
+    fi
+
+  fi
+
+done
+
+# check if backup_storage_dir is mounted and unmount if so
+grep -qs " $backup_storage_dir " /proc/mounts
+if [ $? -eq 0 ]; then
+  umount $backup_storage_dir
+fi
+
+exit 0
+