Verify that the access nodes for Exchange Online meet the guidelines. Access nodes run backups and other operations.
Note: For high availability (which is recommended for the first full backup), use 2 or more access nodes.
With Content Indexing
If you use content indexing, use the following guidelines.
Environment | Medium | Large |
|---|---|---|
Mailboxes | 5,000 | 10,000 |
Messages per day | 500,000 | 1 million |
Guidelines | ||
Access nodes |
|
|
CPU or vCPU for the access nodes | 8 cores | 16 cores |
RAM for the access nodes | 16 GB | 32 GB |
Streams per access node | 10 | 20 |
Azure apps | 5 | 10 |
Without Content Indexing
If you do not use content indexing, use the following guidelines.
Environment | Medium | Large |
|---|---|---|
Mailboxes | 5,000 | 10,000 |
Messages per day | 500,000 | 1 million |
Guidelines | ||
Access nodes |
|
|
CPU or vCPU for the access nodes | 4 cores | 8 cores |
RAM for the access nodes | 8 GB | 16 GB |
Streams per access node | 10 | 20 |
Azure apps | 5 | 10 |
Assumptions
The guidelines are based on the following assumptions:
The average mailbox size is 5 GB.
The average number of messages in each mailbox is 50,000.
The average message size is 100 KB.