Because Veeam Backup and Replication doesn’t currently do backups to tape, using a 3rd party tape backup solution can sometimes make archiving backups to disk cumbersome and cause you to run out of disk space. If you run out of space on the disk you are doing your staged backups to, Veeam will give you this error:
CompileFIB failed Client error: There is not enough space on the disk.
Failed to write data to the file [Backup location]
To fix this error, backup the vib and vkb files in this location to a tape or other media before deleting them. You may wish to initiate an Active Full backup in Veeam, after you’ve deleted the files rather than rely on Veeam Backup and Replication to convert the next backup for you.
If you find that you get the not enough space on the disk error a lot, you may consider reducing the number of Restore points to keep on disk in the Retention policy aspect of the job (Edit the backup job, click Storage, then follow your nose).
Note that Veeam Backup and Replication will keep all prior vib files and the vkb required to perform the last x restore points. This means that if you set the restore points to 1, it will keep the latest vib file (incremental backup), the vkb file (which is the first full) and any vib files that occurred between the last full and incremental backup.