I updated my 7x64 Iso upto Dic/2017 just before all the debacle about Meltdown and Spectre, and installed the OS, since then I decided to stop updating the OS, since every update is full of telemetry and also very frecuently bugy, I have Avast Free AV, and run maybe once every 2 months the AV and also Malwarebytes Antimalware free, just to confirm the PC is clean, and I haven't got a single virus. So only updates on my PC are for FireFox, Avast and Antimalware. Now Win7 support is very close to end, I may update my Iso with the final last update, (cleaning as much telemetry as possible) and reinstall 7x64 and will use it as log as there are AV and browser available for it.
So my OS do not grow at same rate as yours, it is using right now 21.5 GB from a 50 GB partition, System restore is deactivated, since I make periodicaly full images of each OS in the PC, documents, all games and majority of programs are installed on another partition, I have backups of all important info on external disks, the idea is keep to OS partition basicaly with only the OS, Office, AV and browser to get the smaller size when making an image of the OS partition. Also have 10x64 on another partition (it was done to get the free HWID register only, almost never used), and Linux Mint 19.2 Cinnamon x64 on a secondary disk, wich I have been testing for about 2 or 3 weeks now and so far found it is a good solid OS (and you get about twice or thrice a week small size updates) only issues are many games and Autocad do not run on Linux, but for anything else it is very fine.