Hello,
I had received same error but bit different environment, I use local ftp directory instead of Microsoft OneDrive,
but got same result as
"Warning:
Harness not finished running at /usr/local/psa/PMM/agents/shared/Storage/ArchiveStorage.pm line 196"
In my case, ftp directory have 100GB and backup file is 54GB(backup saved at /var/lib/psa/dump instead of ftp dir) so
disk space was enough for backup I assume.