hi jared, hope all is well with that super server you are building.
https://forum.rclone.org/t/tmp-files-on-sharepoint-remote/25385
whenever i backup on windows, using rclone, 7zip, fastcopy, i always use VSS as the source.
in the past, i used a simple four line .cmd script to create a temporary snapshot
as detailed at
https://forum.rclone.org/t/i-want-to-share-how-to-enable-vss-for-rclone/11644
and since then i have moved on to a 140+ lines of python code
create a permanent snapshot, mount that snapshot as a local dir, backup from that snapshot and then delete that snapshot.