Chat activity user notification features and general channel backup

One feature that we would find helpful is the ability for users to be notified when their messages receive "likes " or "emoji " reactions from other users. Currently, notifications are only triggered when a message receives a reply. Is it possible to enable this feature, or could it be implemented in the future?

Can we have a feature that archives the content of the general chat channel into a post every 90 days or on a similar schedule for preservation and read only later?

Many thanks