Does a migrate interrupts VM during migration

Couple of years ago I did a migration of VM on 2008 host with VMM2008. I don't remember if there is an interruption during migration.
I need to perform one time backup of live VM. I cannot stop this machine for making an export right now.
So need a confirmation of MIGRATE action. Worst case scenario I can do a backup later with the EXPORT option.
VM on 2008. VMM2008 available.
Thx.
"When you hit a wrong note it's the next note that makes it good or bad". Miles Davis

It depends on your server OS.
If you're running Windows Server 2008 R2 and later then you have live migration available which allows you to migrate without any downtime. Live migration was introduced in 2008 R2, so it isn't available in 2008 RTM. Quick Migration is available
in 2008 RTM, however that does require some downtime. In either case I believe you need to be using a failover cluster to use it.
If you're running Windows Server 2012 then things are a LOT easier, as you now have the use of Shared Nothing Live Migration, which essentially allows you to migrate the server with no downtime, and between two physical servers, without the need for them
to be part of a cluster. Just two boxes sat in a rack on a network, switching a VM from one to the other.

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