UAE rules by emirate
How long must CCTV footage be kept in Dubai?
The figure most widely cited from SIRA's requirements is a minimum of 31 days of continuous recording for most premises, with longer periods for higher-risk categories such as banks and ATMs. The exact period depends on your premises category, so confirm it with your SIRA-licensed installer and size the recorder's storage for the full period plus a margin.
General information, not legal advice. Rules change and vary by premises type: confirm with the relevant authority or an approved installer.