Inexpensive Way Of Upgrading DVRs

I normally deal with IP systems so I am not that familar with anaolog DVR's. I have a customer that wants to upgrade two old 16 channel pelco DVRs. What is a good inexpensive option? I ran the numbers and it is probalby not worth it to use converters to make the units IP capable. The user wants to be able to have remote viewing, and a mobile app is a plus but not needed.

Thanks

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