How to backup & restore with specific period

Hi All,

I’m confusing about how to backup&restore data using influxd backup/restore command.
Now I’m performing the following commands to backup and resotore my data.

influxd backup -portable -database mydb -start 2022-02-28T09:00:00Z backup_path
influxd restore -portable -db mydb -newdb tmpdb backup_path

I expected nothing restored as every data was older than that date(2022-02-28T09:00:00) but found them in tmpdb. (I thought nothing was in the backing up scope)
Is this a correct behavior?("-start" parameter is working correctly??)

I’m using influxdb 1.7.9 on CentOS7.

Many thanks in advance,

Is “-end” required!?