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Safe File Synchronization and Backup with rsync

A practitioner-focused guide covering rsync’s essential options, remote server synchronization, and automated incremental backups.

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Contents
  1. rsync Basics
  2. Essential Options
  3. Local Synchronization
  4. Remote Server Synchronization
  5. Incremental Backup Script
  6. Performance Tuning

rsync Basics

Bash
rsync [] [] []

Essential Options

OptionMeaning
-aarchive mode (preserve permissions, owner, timestamps, and symbolic links)
-vverbose (print progress)
-zcompress during transfer (useful for remote transfers)
-Pshow progress and resume partial transfers
--deletedelete files that exist only on the destination (mirroring)
--dry-runpreview without actually running
--excludeexclude specific files/directories

Local Synchronization

Bash
# Basic copy (watch the trailing slash)
rsync -av /src/dir/ /dst/dir/

# Without a trailing slash, the directory itself is copied
rsync -av /src/dir  /dst/       # → /dst/dir/
rsync -av /src/dir/ /dst/dir/ # → /dst/dir/

# Mirroring (also delete files that disappeared from the destination)
rsync -av --delete /src/dir/ /dst/dir/

Remote Server Synchronization

Bash
# Local → remote upload
rsync -avz -P /local/app/ user@server:/opt/app/

# Remote → local download (backup)
rsync -avz user@server:/var/log/ /backup/logs/

# Specify SSH port
rsync -avz -e "ssh -p 2222" /local/ user@server:/remote/

# Exclude specific files
rsync -av --exclude="*.log" --exclude=".git" /src/ /dst/

Incremental Backup Script

Bash
#!/bin/bash
BACKUP_ROOT="/mnt/backup"
SOURCE="/var/www"
DATE=$(date +%Y-%m-%d)
LATEST="$BACKUP_ROOT/latest"
DEST="$BACKUP_ROOT/$DATE"

rsync -av --delete \
  --link-dest="$LATEST" \
  --exclude="*.tmp" \
  --exclude="node_modules" \
  "$SOURCE/" "$DEST/"

rm -f "$LATEST"
ln -s "$DEST" "$LATEST"
echo "Backup complete: $DEST"

--link-dest performs incremental backups using hard links — unchanged files take no extra space.

Performance Tuning

Bash
# Adjust compression level (0–9, default 6)
rsync -av --compress-level=1 /src/ user@server:/dst/

# Checksum-based comparison (instead of timestamps)
rsync -avc /src/ /dst/
#rsync#linux
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