Backup strategies in Linux CLI - Commands & Configuration

Introduction

Backing up files means making copies of important data so you don't lose it if something goes wrong. Backup strategies help you decide what to copy, when, and where to keep those copies safely.

When you want to save your work files regularly to avoid losing them after a computer crash

When you need to keep a copy of your website files before making changes

When you want to archive old project files to free up space but still keep them safe

When you want to copy your photos to an external drive for safekeeping

When you want to automate daily backups of your documents folder

Commands

This command creates a compressed archive of the /home/username folder and names it with the current date. It helps you save all your home files in one backup file.

Terminal

tar -czf backup-home-$(date +%Y-%m-%d).tar.gz /home/username

Expected Output

No output (command runs silently)

→

-c - Create a new archive

→

-z - Compress the archive using gzip

→

-f - Specify the filename of the archive

This command copies all files from /home/username to /mnt/backup/username, syncing changes and deleting files in the backup that no longer exist in the source. It keeps your backup folder up to date.

Terminal

rsync -av --delete /home/username/ /mnt/backup/username/

Expected Output

sending incremental file list

./

file1.txt

file2.txt



sent 12345 bytes  received 678 bytes  total size 23456

→

-a - Archive mode to copy files recursively and preserve attributes

→

-v - Show detailed output of the copying process

→

--delete - Delete files in the destination that are not in the source

This command lists your current scheduled tasks. You use it to check if your backup jobs are set to run automatically.

Terminal

crontab -l

Expected Output

0 2 * * * tar -czf /mnt/backup/backup-home-$(date +\%Y-\%m-\%d).tar.gz /home/username

This command opens the cron editor where you can add or change scheduled backup commands to run automatically at set times.

Terminal

crontab -e

Expected Output

No output (command runs silently)

Key Concept

If you remember nothing else from backup strategies, remember: always keep a recent copy of your important files in a separate location to protect against data loss.

Common Mistakes

Not using the --delete flag with rsync for backups

Old files deleted from the source remain in the backup, causing confusion and wasted space

Use rsync with the --delete flag to keep the backup folder synchronized exactly with the source

Running tar without compression

Backup files become very large and use unnecessary disk space

Use the -z flag with tar to compress the backup archive and save space

Not scheduling backups with cron

Backups may be forgotten and not done regularly, risking data loss

Use cron to automate backups at regular intervals without manual effort

Summary

Use tar with compression to create backup archives of important folders.

Use rsync with archive and delete flags to keep backup folders synchronized.

Automate backups by scheduling commands with cron to run regularly.