It doesn't sound like it's an LVM-based snapshot, and instead is running rdiff/rsync or something simpler. The original post says we'll need to dump databases to a file prior to the backup window.
I beg to differ
. This is a very sophisticated system which *does* involve LVM snapshots on the host. But what's the difference? Live database files can't be snapshotted, or copied, or rsync consistently, anyway.
Will this take an actual "snapshot" or will we need to stop MySQL, etc. in order to prevent file corruption.
Doing a snapshot does NOT always mean you're doing to get your mysql DB files in a consistent state. It can depend on which type of table engine you're using, for instance...
So dump your DBs to a file before the backup window just like you would with any other backup configuration.