[K8SPSMDB-1115] Leverage storage snapshots for backups

[spron-in]

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Tell us about the feature

Percona Backup for MongoDB supports taking storage snapshots: [https://docs.percona.com/percona-backup-mongodb/features/snapshots.html|https://docs.percona.com/percona-backup-mongodb/features/snapshots.html|smart-link]

This feature is going to be valuable for users who run big clusters (more than few TBs of data) and who want to leverage snapshot capabilities of the storage provider (for example EBS snapshots), instead of object storage.

We might need to implement this in phases:

• Document how this can be done now (mostly manual steps)
• Automate
• Add support for point-in-time recovery

Link to JIRA

[spron-in]

To give more context, I wrote a blog post about this: https://www.percona.com/blog/unlocking-the-power-of-cloud-snapshots-backup-and-restore-your-mongodb-clusters-on-kubernetes/