Definition
- C2
to demonstrate that something is accurate
His report provided evidence to back up his claims, perfectly demonstrating his point.
Scientists use experimental data to back up their hypotheses.
The content of this letter can back up your statements, so please keep it safe.
- B2
to create a duplicate copy of data
I back up my files every week to ensure the data is safe.
Make sure to back up all your data before this update to prevent loss.
To prevent data corruption, we should back up the system regularly.