Many of us need MongoDB Enteprise Edition, but might be short of resources, or would like to compare the value.
I have summarized several key features of MongoDB Enteprise Edition and their alternatives
Monitoring Options:
- MongoDB Cloud Manager: Performance monitoring ($500/yr/machine) => $1000-1500
 - Datadog/NewRelic => $120-$180/yr per machine, Datadog is better for this case
 - DYI using tools such mongotop, mongostat, mtools and integrate w/ grapha and other
 
Replication is super recommended and is part of the community edition:
 Replica set => min 3 nodes, at least 2 data nodes in 3 data centers (2 major DC and one small).
Backup and Restore: 
There are 3 major options (that can be combined of course):
- fsync to mongodb and physical backup:
 - fast backup/restore
 - Might be inconsistent/unreliable
 - Logical backup: based on mongodump
 - Can be done w/ $2.5/GB using the cloud manager w/ Point in time recovery
 - Can be done w/ Percona hot backup
 - Incremental is supported
 - Have a delayed node
 
The first two may be done using a 3rd data node in hidden for backup (high frequency backup) that enable
Encryption Alternatives:
- Disk based encryption => data at rest (can be done in AWS and several storage providers)
 - eCryptFS => Percona => data at Rest
 - Encryption based application by the programmers in the class level before saving to disk.
 
Audit:
Use Percona edition is a good alternative that may close many of your enterprise needs
BI :
Well supported with MongoDB BI Connector in the enterprise edition, but can be done also w/
- Some BI tool supports MongoDB natively
 - 3rd party provider for JDBC connector: such as simba and https://www.progress.com/jdbc/mongodb
 
Bottom Line
Getting your MongoDB Community Edition to meet Enterprise Requirements is not simple but with the right effort it can be done.
Keep Performing,
Moshe Kaplan