You can use the Commvault software to back up and restore Cassandra.
Backups
Data You Can Back Up
All the keyspaces from all the nodes that are in the Cassandra cluster
User-defined data types
Transaction logs or commit logs
Backups You Can Perform
Full backups
Incremental backups
Commit log backups
When You Can Perform Backups
On a schedule: The server plan that you assign manages scheduled backups
On demand: You can perform on-demand backups at any time
Restores
What You Can Restore
The entire cluster
Individual key spaces or column families
Commit logs
Backups You Can Use for Restores
The most recent backup: For example, restore the most recent backup to its original location
A backup from a specific date: For example, restore data to a point in time before it became unusable
Backups from a date range: For example, restore data that was accidentally deleted
Destinations You Can Restore To
The current location (in place)
You can restore the data and update the data directory to perform a recovery. Or you can copy the files to the nodes without updating the data directory.
A different cluster (out of place)