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I'm not sure what effect deleting an EC2 snapshot has on the other ones. For example, if I snapshot an EBS volume 4 times and delete the oldest one, can I still do a full restore from the latest ones? In other words, is there any benefit in keeping old snapshots other than to save incremental changes?
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As long as these orphaned snapshots are not used for other purposes, they can safely be deleted to cut costs. When deleting EC2 instances or EBS volumes, it is easy to forget about their backups.
Optimizing Snapshot Policies As such, taking snapshots too frequently can have a noticeable effect on the performance of the Amazon EBS volume. Amazon EBS snapshots are stored using Amazon S3, with the initial snapshot constituting a complete copy of the source data, which can noticeably increase cloud storage costs.
While the snapshot is in progress it is possible you will notice performance degradation. As far as I know it is typically recommended by Amazon for customers stop doing read/writes (especially database read/writes) to a volume while it is being snapshotted to ensure data consistence.
Amazon EBS Snapshots allows you to improve disaster recovery workflows for your workloads running on premises and on AWS at low costs. You can directly create snapshots of your EBS volumes or your data on-premises, and then use these snapshots for recovery in the cloud.
The only benefit is being able to restore to the older snapshot. Deleting one snapshot does not effect any of the others. Feel free to get rid of the old ones. The new ones will still work.
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