How to configure automatic remote backup in Linux

Most of us have experienced the loss of valuable files and data at some point in time when a local storage system fails. We know the importance of backing up our files and data, but few have implemented a proper backup solution.

Good backup strategies include creating a consistent and automatic backup and store the backup in a remote location.

Automated remote backup in Linux could be implemented by automating rsync to back up to a remote SSH server.

1. Configure passwordless SSH login from your local machine to the remote backup server.

   Related: How to SSH without password

2. Create a directory on the remote server as a backup target.

   remoteuser@remoteserver:$ mkdir -p ~/backup_folder/folder_01

3. Make sure the connecting SSH user has full access to the directory on the remote backup server.

   remoteuser@remoteserver:$ chmod -R 777 ~/backup_folder/folder_01

4. Manually run your backup script on your local machine to test if the backup operation is successful.

   localuser@localhost:$ rsync -av --delete /path/to/folder_01/ remoteuser@remoteserver:backup_folder/folder_01

   Sample of a more complete script for automated backup.

   backup.sh

   #!/bin/bash
    
   TARGET="remoteuser@remoteserver:~/backup_folder"
    
   for i in folder_01 folder_02 folder_03; do
   	rsync -av --delete $i/ $TARGET/$i;
   done
5. Check on the remote server if the files were successfully backed up.

   remoteuser@remoteserver:$ ls -l ~/backup_folder/folder_01

6. Open crontab editor on the local machine.

   localuser@localhost:$ crontab -e

7. Configure cron on your local machine to automatically run your backup script at a set time.

   # Run backup command every day on midnight, sending the logs to a file.
   0 0 * * * rsync -av --delete /path/to/folder_01/ remoteuser@remoteserver:backup_folder/folder_01 >>~/.backup.log 2>&1 

   Related: Crontab Generator

8. Save and exit crontab editor.