Backup Strategies: Full, Incremental, and Differential Backups

The optimal backup strategy varies by organization; this guide introduces the three primary backup types—full, incremental, and differential—and discusses their pros and cons to help you select the best approach for your business.

Full Backup

A full backup creates a complete copy of all files and folders, making it the most time‑consuming method and potentially stressing network bandwidth when performed over the network.

It offers the fastest recovery because every required file is contained in a single backup set.

Regular full backups require the most storage space of any method.

Benefits

Quick recovery time

Drawbacks

Requires the most storage space

Consumes significant network bandwidth

If not encrypted, backups can be stolen

For small businesses with limited data, a full backup is often the simplest and easiest to maintain and restore, but encryption should be considered to protect the data.

Incremental Backup

This method requires at least one full backup, then only backs up data that has changed since the last full backup.

Compared with differential and full backups, incremental backups use the least storage and time, but restoring a full system is the most time‑consuming because each incremental set must be applied in order after the latest full backup.

Recovery requires restoring the latest full backup set first, then sequentially applying each incremental set; loss of any set prevents a complete restore.

Benefits

Uses the least storage space

Consumes relatively little network bandwidth

Drawbacks

Time‑intensive recovery process

If any incremental set is missing or corrupted, a full restore is impossible

Incremental backups are ideal for enterprises handling large volumes of data, but if you have a very low Recovery Time Objective (RTO), consider differential backups instead.

Differential Backup

Differential backup is a compromise between regular full backups and incremental backups.

After an initial full backup, each differential backup captures all changes since that full backup. To restore, you need only the latest full backup set and the latest differential backup set.

This approach requires less storage than a full backup but more than an incremental backup, and restores faster than incremental but slower than full.

Benefits

Uses less space than a full backup

Faster recovery than incremental backup

Drawbacks

Consumes more network bandwidth than incremental backup, though less than full backup

Beyond these three primary methods, many other backup techniques exist—such as virtual full backups, near‑continuous data protection, reverse incremental, and perpetual incremental backups—any of which might better suit your organization’s specific requirements.