never updated this post (forgot about it after i figured it out). here
was my solution...

in my case this problem was related to the partial backups. i simply
deleted the partial backups files and waited for the next wakeup time.
on the next wakeup time, the full backup started and completed without
a problem. i also have permanently switched from rsyncd to smb for the
windows client. smb seems to work much faster for me.

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