Thanks for the thread!
As far as what I am backing up, been there, done that.
Current Project - 560 GB
PDF Library - 75 GB
Documents - 375 GB
Archived Projects - 1.2 TB
Audio - 560 GB
Photo Library - 500 GB
Video - 1 TB
Backups - 1 TB
Everything here would be non-recoverable again if something were to happen to my Backup Strategy. The only thing I would be able to regain would be my PDF Reference Library, because it’s a shared folder on several services.
I continuously add each week to these growing projects. The next question is how often do you go back to them (maybe glacier would be better). I go back to them occasionally either due to see if this is a duplicate or at someone’s request. It’s frequent enough I wouldn’t put at cold storage.
Side note - I have also been tempted to just delete everything and only keep the Audio, Photos and Video Libraries. Projects come and go, but APV are memories that can’t be “done again”.
Side note 2 - Tempted to at times delete it all, previous generations didn’t have all this tech and relied on their own memory or printed photo albums. A roll of 24 memorable pictures. Today, a single picnic ends up being 50-60 pictures that get saved and only 1-3 “good quality” pictures. An argument for another day.