Continuity & support

What is the difference between retention and backup?

2 min read Guillaume Duveau

A backup is a copy of your data. Retention decides how long you keep it. Confusing the two is one of the most common reasons a restore fails on the day you need it.

Backup and retention are often used as if they meant the same thing. They are two different things, and confusing them explains a good share of the restores that fail. A backup is the act of copying your data. Retention is the rule that decides how long each copy is kept before it is erased.

A backup answers “do I have a copy?”

A backup is a copy of your data, taken at a given moment and stored separately. If the original is lost, corrupted or encrypted by an attack, the copy lets you go back. Without a backup, a deletion or an incident is permanent.

Retention answers “how far back can I go?”

Having a backup says nothing about how far back you can return. Retention sets that depth: fifteen days, a year, seven years. The classic trap: a problem goes unnoticed for weeks, and when the time comes to restore, the only copy available already contains the error. Too short a retention makes the backup useless precisely when it matters.

Deciding your retention is managing a risk

The right length is not a technical matter, it is a matter of risk and, sometimes, of obligation. Depending on your sector and your jurisdiction, certain data must be kept for a specific number of years.

The point is not to be alarmed, but to decide with full knowledge: what you must keep, what you have an interest in keeping, and what you can let go. We help you set those rules rather than inherit them.

The reasonable standard: two copies, and tested restores

For most organisations, the right instinct comes down to two points: two copies in two places (one local, one in the cloud), and restores checked from time to time. A backup that is never tested is an assumption, not a guarantee.

That is the aim of our approach to backup: copies that are yours, a retention decided with you, and the certainty that the restore works when the day comes.

Frequently asked

Doesn't Microsoft 365 already back up my data?
Microsoft keeps its service available; it does not back up your data against your own mistakes. A deleted file, an emptied account, an attack: past a short window, that data cannot be recovered without a dedicated backup. It is a distinction many organisations discover too late.
How long should backups be kept?
It depends on your activity and your obligations. Some data is kept for a few weeks, other data for several years. The essential thing is to decide deliberately, not to inherit a default period.
Is a single copy enough?
No. The common-sense rule is to have at least two copies in two places: a local one, quick to restore, and one in the cloud, safe from an on-site incident.
What use is a backup that is never tested?
Nothing reliable. A backup is only worth as much as its restore. Testing that you can actually recover the data is the only way to know the backup works.

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