For me, every hourly backup of Time Machine is quite large, but I don't change so many files so fast. I have determined that the main culprits are under
~/Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles/Main Profile. I hope to be able to exclude something here from Time Machine backups that will safely reduce the size of each backup per hour.
I think MS Outlook 16.x downloads emails and attachments
from the Outlook server below, just for indexing and speed reasons. If you ever had data loss, those emails and attachments would be downloadable again from the Outlook server. Therefore, excluding them from hourly backups seems reasonable to me.
However, search the Internet for files to exclude from Time Machine backups. Never Mention this way. I can't say if that is because excluding these files is not safe, or because MS Outlook 16.x is too new for people to discover these files. I find the latter hard to believe, especially since the route contains "Outlook fifteen".
Is there anything under this path that I can safely exclude from my Time Machine backups?