- As an AWS admin we are expected to do some operations such as
- Disaster Recoveries
- OS patching
Backups in AWS
- In AWS, the generic term used for backup is Snapshot
- Generally the first snapshot is full backup and snapshots from there on are incremental in nature
- When we try to delete the latest snapshot the latest changes will be lost. in the below image brown changes are lost
- When we delete the oldest backup, the contents of snapshot gets copied into depending snapshots, so we are not loosing data
Backups can be taken in two ways
- manual backups
- automated backups
What is difference between backup and archive?
- backup is taken for quick recoveries.
- Backups are frequently accessed
- archival is done for disaster recoveries
- archivals are rarely accessed
- MTTR (Mean time to Reocover) with backups is in hours and from archives is in days
- Archives are stored in low cost storage solutions (Tapes) whereas Backups are stored in moderate cost storate solutions
What is point in time recovery (PITR) ?
- Ability of a backup solution to restore itself to some date time in past.
- Business Continutity and Disaster Recovery (BCDR) is an essential setup for all production systems.
- Ensure you have an ec2 instance with
- apache server on any linux based ec2
- RDS database with some data in it.
- We will be using the following services