The wrong sort of weather is ravaging the nation's PCs, with lighting from summer storms causing a 25 per cent rise in computer mishaps, according to Ontrack Data Recovery.
Ontrack said that the huge surge in emergency calls it received over the past weeks was the direct result of lightning that came with recent heavy rain and thunderstorms.
The increase in instances of data loss was reported across all businesses, from home office users to large corporates.
And with further storms predicted, the worst may not be over for organisations that do not have back-ups of business critical emails, financial records, invoices and other critical documents.
Apart from not taking your PC outside to the top of a hill in the middle of a thunderstorm, Ontrack advises users take steps to protect themselves from lightning.
Companies and individuals should install a surge protector, not just a power strip, between the power socket and the computer's power cable.
Small businesses with networks should get surge protectors that negate power spikes normally transmitted through network cables.
Firms should also use dedicated circuits to ensure that IT equipment has its own power circuit and is not sharing the power with air conditioners, heaters and other devices.
Additionally Ontrack advised that users should disconnect the power cord during an electrical storm, and beware that high voltages can enter the computer through a phone line connected to a modem.
Businesses with network servers are advised to invest in some form of uninterruptible power supply, which cleans the supply and features backup batteries to keep servers running during power outages.
Adrian Palmer, managing director at Ontrack, said in a statement: "Severe weather can cause significant computer damage.
"We can't stop the power of nature, but by safeguarding IT systems if there is a storm on the horizon, the chances of experiencing data loss can be minimised.
"One caller said the thunder was so loud he instinctively ducked. When he looked back at his computer screen, it had shut itself off and wouldn't reboot."
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