Clearing out Backups History in OpsCenter 6.0 and 6.1 GUI

Via the GUI there is no way to clear out the events in the backup activity. One way though is that you can truncate the "OpsCenter".backup_reports then synchronize the backup data to just have the most recent available.

http://docs.datastax.com/en/opscenter/6.1/opsc/online_help/services/syncBackupData.html

the following is the keyspace table for the `"OpsCenter".backup_reports:

CREATE TABLE "OpsCenter".backup_reports (
    week text,
    event_time timestamp,
    backup_id text,
    type text,
    destination text,
    deleted_at timestamp,
    full_status text,
    keyspaces text,
    status text,
    PRIMARY KEY (week, event_time, backup_id, type, destination)
) WITH CLUSTERING ORDER BY (event_time DESC, backup_id ASC, type ASC, destination ASC)
    AND bloom_filter_fp_chance = 0.01
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
    AND comment = '{"version": [6, 1, 0], "info": "OpsCenter management data."}'
    AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'}
    AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'}
    AND crc_check_chance = 1.0
    AND dclocal_read_repair_chance = 0.1
    AND default_time_to_live = 0
    AND gc_grace_seconds = 864000
    AND max_index_interval = 2048
    AND memtable_flush_period_in_ms = 0
    AND min_index_interval = 128
    AND read_repair_chance = 0.0
    AND speculative_retry = '99PERCENTILE';

here is Sample Data:
cqlsh:OpsCenter> select * from backup_reports ;

week | event_time | backup_id | type | destination | deleted_at | full_status | keyspaces | status
--------+--------------------------+-----------------------------------------+--------+------------------------------------------------------------+------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------+---------
201721 | 2017-05-23 21:08:49+0000 | opscenter_adhoc_2017-05-23-21-08-49-UTC | backup | {"path": "", "provider": "server", "id": "OPSC_ON_SERVER"} | null | {"destinations": [], "started": 1495573729, "finished": 1495573730, "datacenters": [], "cluster_id": "dse", "keyspaces": {"dse_perf": ["node_slow_log"]}, "details": {"subrequests": {"10.200.178.27": {"started": 1495573730, "finished": 1495573730, "cluster_id": null, "details": {}, "id": "9b860f7f-75fe-4cdc-8e99-1af5938bd4aa", "state": "success"}, "10.200.178.26": {"started": 1495573730, "finished": 1495573730, "cluster_id": null, "details": {}, "id": "897b2c64-5d0d-4294-be45-c60afdc18288", "state": "success"}, "10.200.178.30": {"started": 1495573730, "finished": 1495573730, "cluster_id": null, "details": {}, "id": "4260899a-d1a8-40bb-8ff8-88eac6e169c9", "state": "success"}}, "message": ""}, "id": "1b50dd86-9ca0-4226-a2f0-8222eeea5a5a", "state": "success", "tag": "opscenter_adhoc_2017-05-23-21-08-49-UTC"} | {"dse_perf": ["node_slow_log"]} | success

(1 rows)