Most NVRs and DVRs come with out a built-in Hard Drive,you may have to buy it with their Dvr or buy it separately with large capacity, such as 1TB, 2TB, 3TB, etc. And you can buy internal hard disk drive via e-SATA on the NVR/DVR for more storage. Recording a security camera to NVR or DVR means recording the video to the HDD.
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It's also illegal to put them wherever people are expected to have some privacy, like a bedroom, changeroom, or your own property. ... Putting cameras in bathrooms will be considered illegal and it is act of privacy violation. Bathroom is considered private and installing a security camera there will not be acceptable.
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You should never use a Nest camera designed for indoor use outside. Doing so may cause performance issues, lead to damage and void your warranty. However, you may use Nest cameras designed for outdoor use inside your home, although it isn't recommended.
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