Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
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I have a synology server and started to use its backup feature to the dns 323. I have two 3TB drives and works fine.
When I backup some of my folders to the dns 323 it take s a few minutes then backups properly. These folders are typically 10 Megs upto 60 GB.
However when I backup my time machine folder (which is 3 TB), the dns takes forever to connect and after 20 minutes or so, the backup app says 'connection to the destination server is timeout'.
I figure the file is so large that it timesout calculating space and backup fails. Is there a way to increase the connection time? and if so, How?