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backup-files.service

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+[Unit]
+Description=Automatic backup files
+After=network.target
+
+[Service]
+Type=simple
+User=root
+ExecStart=/home/backup-files.sh
+Restart=always
+RestartSec=3600
+
+[Install]
+WantedBy=multi-user.target

backup-files.sh

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+#!/bin/bash
+
+# Paths
+backup_path="/backup-disk"
+origins=("/home/user1/files" "/home/user2/files/documents")
+destinations=("$backup_path/backup-user1" "$backup_path/backup-user2")
+
+# Function to perform backup for each origin-destination pair
+perform_backup() {
+    local origin="$1"
+    local destination="$2"
+
+    # The origin folder not exists
+    if [ ! -d "$origin" ]; then
+        echo "Origin folder not exists: $origin"
+        return 1
+    fi
+
+    # The mount point disk not exists
+    if [ ! -d "$backup_path" ]; then
+        mkdir -p "$backup_path"
+        echo "Mount point disk created"
+    fi
+
+    # The disk not mount
+    if ! mountpoint -q "$backup_path"; then
+        echo "Mounting disk..."
+        mount "$backup_path"
+    fi
+
+    # The destination folder not exists
+    if [ ! -d "$destination" ]; then
+        echo "Folder $destination created"
+        mkdir "$destination"
+    fi
+
+    # Execute rsync
+    rsync -av --delete "$origin/" "$destination/"
+
+    # Verify folder backup
+    if [ $? -eq 0 ]; then
+        echo "Backup successfully saved $origin on $destination"
+    else
+        echo "Error on copy files"
+        return 1
+    fi
+
+    return 0
+}
+
+# Iterate over origin-destination pairs and perform backup
+for (( i=0; i<${#origins[@]}; i++ )); do
+    perform_backup "${origins[i]}" "${destinations[i]}"
+done
+
+# Umount disk
+if mountpoint -q "$backup_path"; then
+    echo "Umounting disk..."
+    umount "$backup_path"
+fi

fstab

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+# /etc/fstab: static file system information.
+#
+# Use 'blkid' to print the universally unique identifier for a
+# device; this may be used with UUID= as a more robust way to name devices
+# that works even if disks are added and removed. See fstab(5).
+#
+# systemd generates mount units based on this file, see systemd.mount(5).
+# Please run 'systemctl daemon-reload' after making changes here.
+#
+# <file system> <mount point>   <type>  <options>       <dump>  <pass>
+
+# Others discks
+UUID=  /boot/efi       vfat    umask=0077      0       1
+
+# backup external disk
+UUID=  /backup-disk    ext4    defaults        0       0