> I had the exact same behavior on the local 2-drive-mirror, with the
> different that I could do only a single backup at a time, since the IO
> would make the system unresponsive (now I can easily do 3-4 at the same
> time).

Having the system do less work would naturally make it more responsive, so
this is logical.  This doesn't mean it's faster, obviously -- and note
that while 3-4 at the same time may not be noticeably bogging down the
local system, since the I/O grunt work is handled by the NFS server, it's
possible that it's entirely saturated.

> Also, just to point out:
> df/ls/du/find/etc on the external machine (where the NFS is) take hours
> (!),
> so maybe it's not the NFS itself but the directory/file structure.

This seems particularly important!

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