Since both are ext4 filesystems, I'd prefer a dd copy from one to the other. See this on some sample command line suggestions on how to do this over the network:

https://www.ndchost.com/wiki/server-administration/netcat-over-ssh

Just make sure the source and destination LV is unmounted during the copy, but it is likely to be significantly faster (this could be many days faster, though if the total filesystem size is only 200G, then it may not make that much difference) than the rsync method.

Regards,
Adam


     While trying to transfer the backups in /var/lib/BackupPC from the C6
     to the C7 machine, I run out of space.  On C6, the file system is a
     175 GiB LV in ext4 holding about 137 GB.  On C7, I started with a 200
     GiB LV in ext4 and ran out of space.


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