Not that I'm a great expert, but I'd agree with only fixing something if it's not working. General tips: store hardware in a cool(ish) dry place. Don't store in a loft/attic/garage which can have large temperature variations and be damp.
Try to power on hardware every year or so, maybe leave it turned on for 24 hours. That could help prolong the life of electrolytic capacitors I think.
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