What is an image backup?
NOTE: Before reading this article, Mirapoint highly recommends reading the latest version of the Mirapoint Backup and Restore Guide.
Backup solutions are not available on the RazorGate family of appliances.
One of the following products is required for Mirapoint image backup:
- Veritas NetBackup for Server, version 3.2 or higher (replace Server with your platform)
- Veritas NetBackup for NDMP, to match the above server version
- Legato NetWorker for NDMP, version 6.0 or higher
- Tivoli Storage Manager, version 5.4 or higher
- BakBone NetVault, version 7.4 or higher
Image Backup Without Saving History
- Licenses must be applied before starting the restore.
- The mail store on the system must be at least as large as the mail store of the system where the image backup was done.
Image Restore (Not Selective Restore)
- Image restore works only if you are restoring to exactly the same MOS version and hardware platform from which the backup was taken.
Temporary Space Requirements
- For image backup, there is a .snapfile in the /usr/store directory which requires approximately 300MB for a 25GB backup or 500MB for a 35GB backup. Larger backups require incrementally more space. The maximum space allowed is ten percent of /usr/store. The snapfile remains after the backup and is reused for the next backup. Â
- For selective restore, a temporary directory is created in the /usr/store/backup directory that is the same size as the data being recovered. For example, restoring a 1GB mailbox requires 1GB for this temporary directory. The temporary directory is automatically cleared when the restore is complete.
- There is also a restore status file, which lists all the recovered messages. The more recovered messages, the larger this file becomes. Â
- For systems using the NDMP performance patch, there are additional backup space requirements:
- If you save the file history, the additional temporary space requirement is (in bytes): the number of characters in the full path for each file + 12, then multiply the sum of the total bytes for all files by 4.
- If you do not save the file history, the additional temporary space requirement is (in bytes): the number of used inodes, multiplied by 16.
- This additional temporary space is cleared once the backup completes.