Verifying Backups and Restores

SUMMARY

With data verification and self-healing, PHD Virtual Backup's TrueRestore technology ensures the data you backup is the data you can restore

ISSUE

With data verification and self-healing, PHD Virtual Backup's TrueRestore technology ensures the data you backup is the data you can restore. Verification can be enabled during the backup and restore processes. For backups, you can additionally set the level of verification to use.

In addition to verify options, TrueRestore includes backup data self-healing. When a bad block is identified for a Virtual Full backup, it is flagged, and the PHD Virtual Backup Appliance will then attempt to repair the bad block, further ensuring the integrity of your data.

To verify backups

  1. At the Options step of the Backup Wizard, use the Verify menu to select the type of verify to use.

    • None - This option is available for Virtual Full backup mode, only. Data is written but not checked. If a bad copy occurs or the target storage has a defective sector, valid restoration will not be possible.
    • Quick - For Virtual Full backups, the Quick option verifies only new data. Because deduplication for Virtual Full backups allows for the reuse of data blocks, using this option lets you verify only the new blocks of data written to the data store. This ensures that all blocks written to the data store have been verified once after being written. Note that for Virtual Full backups, this option is most useful if None is never used. If both None and Quick are used, then some blocks for the VM being backed up, even with Quick selected, may never be verified. Selecting this option will impact performance. When creating Full/Incremental backups, this option will verify meta data for all backups in the Full/Incremental chain (This is the only option available for Full/Incremental backups). If corrupted data is found, the corrupted backups are removed and the backup chain is continued. If a corrupted full backup is found, the entire chain may be removed and a new chain started to ensure data integrity.

    • Full - This option is available for Virtual Full backup mode, only. Verify every data block needed for a restore after a backup. For Virtual Full backups, this includes blocks that are common to multiple backups and will result in the same blocks being verified multiple times.This option will impact backup performance. Note for VMware users: With CBT enabled, only changed blocks are read each backup and therefore the verify Full option will verify only changed data - not all blocks. To ensure all blocks are verified and read, disable CBT.

To verify restores

  1. In the Recovery Wizard, at the Define Job Settings step, select the check box Verify recovered VM(s) and disks.

    This option instructs PHD Virtual Backup to verify the restored VM. What that means is, during the restore process, each block that is written is immediately read back and verified against the backup file.

Was this article helpful?
0 out of 0 found this helpful
Have more questions? Contact us