[p4] Perforce Backup question

[G2345C]

Hi all,
I am trying to reduce the downtime of our back up, so
here i have a question, What we are doing right now
is: 
1/ shut down p4 server
2/ make checkpoint and journal p4d -jc
3/ copy $P4ROOT to a save place
4/ Start Server

The problem is that our depot is too big that step 3
(copy) is taking too long.  I am thinking of Mirror
$P4ROOT, that has the following steps: 
1/ shut down P4 server
2/ make checkpoint and journal p4d -jc
3/ stop the Mirror
4/ Start P4 server
5/ Copy the Mirror to a save place
6/ Turn the Mirror back on
Is it doable? and any good or not good about it?

Thanks


 
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