WeaKnees has some good options
I got a WeaKnees 12TB Roamio Pro last year, and I love it.
It was added to my other Amazon TiVo 4TB Roamio Pro and my Amazon TiVo 1.5TB Roamio Basic and 2 Amazon TiVo Minis.
The WeaKnees upgrades have worked flawlessly with nearly constant use and is currently 70% full.
I am an Electrical Engineer and have done a lot of upgrading by myself in the past, but WeaKnees was a good option.
After a year, I am still happy with the decision.
I can not say that about everything I bought.
I will probably be putting my TiVo on an UPS battery as I live on an island on the ocean and we seems to have a lot of power fluctuations that cause the TiVo to recycle.
I currently have my Modem, Cell Phone Mini Tower and Airport Router on an UPS system. That has worked well.
Have 8 TiVos, 17.5TB & 16 Tuners: 12TB Roamio PRO, 4TB Roamio PRO, 1.5 TB Roamio Basic 2 Minis&2S2
Worked on NASA Moon Landings
Retired Chief Scientist