[Users] Backing up ploop-based containers: meaning of the 'dump' directory

[Toke Høiland-Jørgensen]

Hi

I'm putting together a backup solution for ploop-based openvz
containers, using `vzctl snapshot` and then backup up the
/vz/private/$CTID directory. However, whenever a snapshot is created,
the directory /vz/private/$CTID/dump is created with a file named after
the snapshot UUID (as far as I can tell). It disappears again once the
snapshot is removed.

What is the purpose of this directory, and is it safe to exclude it from
the backup?

Thanks,

-Toke
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