Add get_backup support for rocksdb

[kriszyp]

Feature Summary

The get_backup operation should return a copy of (a snapshot of) of a database. This is implemented for LMDB, but should be implemented for RocksDB. This should return a tar of the database files, most likely.

Problem This Solves

Provide support for external backups.

Proposed Solution

Likely will use https://github.com/facebook/rocksdb/wiki/How-to-backup-RocksDB to create a backup file and then download it

User Stories

No response

Alternatives Considered

No response

Priority/Impact

None

Examples or References

No response

Additional Context

No response

Are you planning to fix this issue?

No, just reporting the issue

First-time contributor support

• I'm new to contributing and would appreciate guidance on the process
• I'd like help understanding the project structure
• I need assistance with setting up the development environment
• I'm comfortable contributing, but new to this project specifically

[cb1kenobi]

Fixed in #1831.