Minimum free Space on vsphere Host for B+R Backup?

[User56]

Hello,

Client have Veeam B+R Version 8 with vsphere 6.5
vSphere Host has only 100 GB free and I need 40 GB to add to a Virtual Mashine

Do you think there could haben a collision /escalation? (when backup is starting?)

I know that official recommendation is 20-25% free space.

New Server is arriving within the next month.

thx, best regards

[vijayG]

if you don't have enough space on Datastore, Veeam Backups will not happen.
recommended free space is 20% on host

[vmJoe]

There needs to free space large enough to hold a VMDK(s) snapshot during a backup and maintain any growth of the snapshot during a backup cycle.

If a snapshot fills up a datastore, all VMs running on that datastore will stop functioning properly.

I have seen customers not keep a lot of free space on a datastore and Veeam still backups VMDKs on that datastore with now issue because none of the VMs were large, or highly transactional. If you VMs are highly transactional I recommend leaving that 20% free space on them.