Arkeia Software

Backup To Disk

Backups to disk are increasingly popular due to their simplicity and the benefits of random access (non-sequential) storage media. Today, 48% of WD Arkeia customers back up data direct-to-disk, and the vast majority of these customers replicate backup sets for safekeeping.

Strengths Weaknesses
  • Rapid single-file restores
  • Easy administration
  • Expensive for rarely accessed data (e.g. archives)
  • Disks are fragile and transport of disks off-site is expensive


A strategy that depends fully on local storage of backups cannot be secure. WD recommends that backups to disk be complemented by replication of backup sets from disk to tape (for transport off-site) or cloud (at an off-site facility). With the advent of RAID, backup-to-disk through-puts have grown substantially. With the adoption of SATA disk drives, the cost of disk storage has significantly declined.

Not all backups to disk are comparable.

  • Backup to disk varies in terms of:
    1. security (privacy, integrity, authenticity)
    2. data reduction (e.g. deduplication effectiveness)
    3. throughput (MB/s)
  • And restore from disk varies in terms of
    1. security
    2. time-to-completion
  • WD Arkeia excels in all these dimensions. WD Arkeia’s backup-to-disk is secure because encryption protects data beginning at the backup agent. WD Arkeia’s Progressive Deduplication™ technology implements the industry’s most advanced data deduplication at the backup agent. WDArkeia’s backup throughput is higher than others’ (e.g. Symantec ® Backup Exec®) because WD Arkeia multiplexes data from multiple agents.

    WD Arkeia restores are highly efficient because administrators can specify the moment in time (the "recovery point") for which data should be restored. WD Arkeia restores only those files which correspond to the disk state at the desired moment in time. Because files are never overwritten, restore operations are very fast.

    WD Arkeia allows backups-to-disk to be chained to replication to disk, tape, or cloud. When the backup is complete, the replication process will begin.