Every hourly Time Machine backup is quite large for me, but I don't change that many files so rapidly. I've determined that the main culprits are under
~/Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles/Main Profile. I'm hoping I can exclude something under here from Time Machine backups that will safely reduce the size of every hourly backup.
I believe MS Outlook 16.x downloads email messages and attachments from the Outlook server under here, just for indexing and speed reasons. If I ever had data loss, those email messages and attachments would be downloadable again from the Outlook server. Therefore, excluding these from hourly backups seems reasonable to me.
However, searching the internet for files to exclude from Time Machine backups never mentions this path. I can't tell whether that is because excluding these files is unsafe, or because MS Outlook 16.x is too new for people to have discovered these files. I find the latter hard to believe, especially since the path contains "Outlook 15".
Is there something under this path that I can safely exclude from my Time Machine backups?