Dataexchange between two VMs

Hi,

I have to do a backup and restore process. The data volume is approx. 200 GB from one VM to another.
Therefore I would like to use one ext3 storage in proxmox for both VMs
Is it possible to use one ext3 virtual storage in two VMs, where only one is aktive at the same time?
And how have I do it?

regards,
maxprox