There are two aspects to assessing a servers suitability as a backup server; its backup capacity and the requirements of the servers being backed up.
The Backup Server Backup Quota
Backup is supported to servers with a hard disk of 160GB or larger. The quota available for backup usage can be checked using the process below. On servers with a smaller hard disk, no backup quota is supported.
The approximate space allocated for the backup quota can be calculated as follows:
•Backup Quota ≈ (0.8 x HDD Capacity) – 92GB if HDD Capacity ≥ 160GB, otherwise zero.
oSo for a typical 500GB hard disk, the backup quota is approximately 308GB.
oNote this is only approximate. The quoted disk capacity from a disk manufacturer or a virtual server platform differs from the capacity reported by the operating system.
To Check the Backup Quota
1.Login to the backup server's web manager menus.
2.Click 
and select Platform View.
3.On the System tab, note the Quota available for backup data value. Note this is the total space usable for backups, it does not account for the space already used by any existing backups.
4.Click Solution to exit the platform view.
Space Required for a Full Backup
The following tables show the potential space required for a worst case full backup. That is, one that assumes all the users have used their voicemail mailbox and other facilities to their maximum capacity.
The minimum disk size column indicates the disk hard disk size required to have a sufficiently large backup quota (see above) for at least one maximum full backup.
Server Edition/IP Office Select Network. |
||
|---|---|---|
Users |
Max. Full Backup |
Min. Server Disk Size |
100 |
35GB |
160GB |
750 |
78GB |
214GB |
1500 |
127GB |
275GB |
2000 |
158GB |
320GB |
2500 |
189GB |
360GB |
IP Office Application Server/Unified Communications Module |
||
|---|---|---|
Voicemail Pro Users |
Max. Full Backup |
Min. Server Disk Size |
20 |
30GB |
160GB |
50 |
32GB |
160GB |
100 |
34GB |
160GB |
150 |
37GB |
165GB |
A backup server can, subject to available space, support up to 14 backups where each backup contains details for multiple services on multiple servers. Once the backup server has 14 backups, an additional backup causes the automatic deletion of the oldest previous backup. Similarly, if the available backup space has been exhausted, the oldest previous backup is automatically deleted to create space.