With Arch-likes its ever so slightly harder to roll back package versions but still doable.
Considering kernel maintainers are only now removing support for i486 and i586 you will be fine for a long time with anything from the past 2 decades.
And push comes to shove you can just tell your package manager to not update something and not worry about it.
Like mentioned though, there are a lot of upgrades and they are constant so if bandwidth is a problem, a Debian-like might be more for you.