You can resolve this problem partially by changing the "Allow less secure apps" setting in your gmail account from OFF to ON. To do this log-into your Google account from your PC (laptop, tablet or smartphone), then select the "Apps with account access" link in the "Sign-in & security" section and make changes.
Do not lower security level in your main Google account! You have to keep in mind this Google warning: "Please be aware that it is now easier for attacker to brake into your account." That means you have to create an additional/independent account, that will be less valuable to you if it gets compromised.
In addition, there is a chance, that DVR has real known security problems. That means all your computers and devices, connected to the same router could be compromised. That also means you have to "Install a more secure app that uses stronger security measures. All Google products, like Gmail, use the latest security measures." Note: "more secure app in our case - is a more secure DVR's firmware.
If you want to protect your video records - you can use cloud services similar to Zero loss architecture (which provides ability to record a single video stream to multiple locations simultaneously) or you can buy a Samsung SmartCam IP Camera SNH-1011 or Samsung IP camera, that allow you to upload short video clips (up to 30 sec.) to the Google Drive for FREE (up to 15 GB).
In some cases Google Nest Cam , Dropcam and similar IP cameras automatically back-up video footage (which is recorded to the camera's SD card) to the Nest Awaee cloud storage, Google Drive or a similar accounts. Unfortunately, there is no overwrite option for almost all IP cameras in Google Drive space.
Here is an example of the real case where corrupt police in Kiev (the capital of Ukraine) robbed a jewelry store. They destroyed the surveillance system, but thanks to cloud storage this video was saved and the bad cops were captured.
Useful links:
Google Drive
Unlimited Google Drive ($10/user/month)
Microsoft OneDrive (FREE 15 GB)
Local vs. cloud camera storage
How Cloud Cameras Work
How to set up a reliable cloud storage/backup Setup a Cloud CCTV System for the Home
Cloud storage for your security cameras and DVRs
Some notes and recommendations:
- shop around for a bargain price like these
- chose a DVR/NVR with a sturdy AV-Rated HD (Hard Drive) or Western Digital Purple HD with caching algorithms specifically designed for the high-definition surveillance security systems similar to these Surveillance-class hard drive. More details about WD Purple Surveillance Storage/HD.
- do not rely on wireless cameras, because even a simple jammer could disable almost all types of existing cameras working via wireless video, wireless LAN and Bluetooth bands,
- install outdoor cameras properly to catch intruders outside of your house, before they attempt to disable your system,
- install your cameras at least 9-feet high to avoid neutralizing of your cameras by an intruder/burglar with a spray paint. In addition keep in mind that an intruder can easily locate and compromise any camera with IR LEDs thanks to a $1 flashlight. As you can see here even short exposure has blinded the camera. While a simple laser pointer could temporarily disable or even destroy your cameras. Starlight cameras, which are invisible at night can be a possible solution,
- direct sunlight can damage your cameras,
- use fire-rated cables similar to this one,
- do not buy DVRs without a FREE Dynamic DNS Server, if your ISP does not offer a static IP,
- recording resolutions: 8K (7680x4320), 4K (3840x2160), 5 Megapixel (2560x1920), 4 Megapixel (2240x1680), 3 Megapixel (2048x1536), 1080p (1920x1080), 720p (1280x720), 960H (960X480), D1 (704X480), HD1 (704X240), CIF (352X240).
- 960H recording is 5 times larger than CIF and over 33% larger than D1. 960H is the perfect resolution to fit your widescreen TV or monitor. 960H allows you to record at a resolution of 960 by 480 horizontal TV lines.
- for a DVR with 960H recording the best matching cameras are those with 700 TV lines, because 700 TVL cameras have an effective resolution of 976 x 582.
That means there is no reason to buy more expansive cameras with more TV lines for DVRs of this class, unless you find cameras with better optics, night vision capability or another feature important to your application (setup). So, 1000TVL cameras, for example, are over-bounded for a DVR with 960H recording resolution, because they have 960 X 756 effective resolution. Nevertheless, almost all CCD manufacturers are ceasing production on 700 TVL sensors. Image Sensor Companies.
- use a speed test similar to this one to check an Upload/Upstream Speed of your Broadband connection: