ZxBackup on NFS partition

Hi,

I am going to migrate our zimbra server to a virtual machine.
To optimize/reduce space in our VM, I think to use nfs mount point on backup path (/opt/zimbra/backup/zextras/) of Zextra backup.

However, the nfs server may not be always available (cause of reboot). I don't know how zextra backup will react if the mount point is not accessible.

I don't know if it's a good solution, but maybe some of you have feedback ?