Offsite Backup Explained
What an Offsite Backup Is and How It Protects Your Site
An offsite backup is a copy of your website or data stored in a different physical location from the server it protects. If the original server, its data center or its building is lost, the copy still exists and can be used to restore the site.
Most backups are first made on the same server or in the same facility as the live site, because that is the simplest place to run them. That works for a deleted file or a broken update. It fails when the event that causes the loss also reaches the place where the backup is stored. A fire, a flood, a power failure that damages hardware, or a suspended hosting account can take the site and its local backups offline together.
An offsite copy breaks that shared risk. Because it sits somewhere else, a failure at the original location does not remove the only copy of your data.
Offsite does not have to mean another country. It can mean a different data center in the same region, a storage service run by another company, or a copy you download and keep on a separate computer or drive. Each option trades cost and convenience against how far the copy is from the original risk. Backups made by the host itself are covered in what your hosting provider's backups do and do not cover.
Why Local Backups Share the Same Risks as the Site
A local backup protects against small mistakes: a deleted folder, a damaged database table, or a plugin update that breaks the layout. For those problems, a copy on the same server is quick to restore from.
The weakness is shared risk. Any failure that affects the server can also affect its local copies. Typical examples include:
- a storage system that fails in a way that affects every disk attached to it
- a data center outage or fire that takes the whole facility offline
- an attacker who gains control of the server and deletes or encrypts the backups stored beside the live files
- an account that is closed or locked by mistake, which can cut off access to everything inside it
Keeping a copy elsewhere is the dependable answer to these cases. This is why offsite storage is a core part of the 3-2-1 backup rule, which asks for at least one copy kept off-site.
Frequently asked questions
Is a backup on another server in the same data center offsite?
Not in the full sense. A copy on a different server in the same data center protects against a single server failing, but not against a fire, a power outage or another event that affects the whole facility. A backup is generally treated as offsite when it sits in a separate location, such as another data center, region or storage provider.
How far away should an offsite backup be stored?
There is no single required distance. The aim is to store the copy where one local disaster is unlikely to reach both places. For many small sites this means a separate data center, often in another city or region. Storing a copy with a different provider, such as a cloud backup service, adds protection against problems at the first company.