test restore of VM backups

If you use a backup application e.g. backup exec/veeam for backing up of virtual servers, if the backup job completes fine day in day out, and assuming you have selected all relevant drives etc when you come to restore can there still be issues in restoring the data if the backup file is available, e.g. the storage hosting the backup files is online and healthy (these are disc based on not tape based)?

Can you give some examples of the type of issues that could STILL prevent the restore of the data from within the backup itself, this justifying the benefits of a test restore schedule. I totally get test restores are a good idea for many scenarios, e.g. to find if you have missed critical data off the backup selection list and therefore wouldn't be able to restore it, or to find issues with the backup media itself, e.g. tape failure, but I would be very interested to hear what kind of issues can still prevent the restore of data if a backup has been successful created each day, all relevant data was backed up,  and the backup file is easily accessible on disc.
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pma111Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Repo/Datastore Corruption, Invalid Backup of VM

We test restore backups, at random once a week.
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pma111Author Commented:
What level of test restores do you perform e.g entire machines drives databases?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Everything to ensure the service is up and running.

If that includes many Servers, Databases, etc
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Dariusz TykaICT Infrastructure Specialist Senior Commented:
If you would use Veeam B&R you have a nice feature called surebackup/surereplica. It allows you to boot your VMs in isolated environment and check if your applications inside VMs are ok. It can be automated to run even after each backup to confirm in case of recovery you are ok. You can read more about it here:
https://helpcenter.veeam.com/docs/backup/vsphere/surebackup_recovery_verification.html?ver=95
Another nice feature of Veeam is health check of backup files to detect possible storage corruptions. Learn more here:
https://helpcenter.veeam.com/docs/backup/vsphere/backup_health_check.html?ver=95
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