How to flush caches and lock and unlock the Influxdb databases

Is there any way we can flush all the caches to the db (disk) and lock and unlock the db for a while. My requirement is to automate the snapshot capturing of the disk where db is kept for backup. I want to make sure all the data is written to disk and no data is being written while capturing the snapshot.

Here is a link on FLUSH & LOCK queries of MySQL for the same. I am wondering if Influxdb has similar kind of queries / REST API.

Also please let me know if there is any better idea to take backups other than this method.

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