Influxdb Backup is not working properly in influxdb OSS V2.1.1

Nobody has claimed this yet.

## About the bug

**Steps to reproduce:**
List the minimal actions needed to reproduce the behavior.

1. just perform the backup cli command `influx backup -t {$rootToken} /var/backups/backup_$(date '+%Y-%m-%d_%H-%M')`
2. then check the backup log and files, data are incomplete

**Expected behavior:**

influxdb take a full backup of all the data stored in it, in my case it should be around 1.5-2.0 GB

**Actual behavior:**
data in the backup files are only 1.3 Mb, WARN: Shard xxxx removed during backup shown frequently in the log

**Visual Proof:**


data in influxdb seem to be ok, just the backup is buggy.
A downgrade back to v2.0 caused errors during the initialization of the container application.

## About your environment

**Environment info:**

influxdb OSS v2.1.1, installation by container

Linux 5.10.60-qnap x86_64
InfluxDB 2.1.1 (git: 657e1839de) build_date: 2021-11-09T03:03:48Z

**Config:**

```
version: '3.5'
networks:
influxdbnw:
name: influxdb_network
services:
influxdb:
image: 'influxdb:2.1.1'
restart: always
container_name: influxdb
hostname: 'influxdb'
volumes:
#- ./data:/root/.influxdbv2
- .\conf\influx\data:/var/lib/influxdb2
- .\conf\influx\config:/etc/influxdb2
- .\conf\influx\scripts:/docker-entrypoint-initdb.d
- '{§backup path}:/var/backups'
- ./config/influx-configs:/etc/influxdb2/influx-configs'
ports:
- '8086:8086'
networks:
- influxdbnw
environment:
- DOCKER_INFLUXDB_INIT_MODE=setup
- DOCKER_INFLUXDB_INIT_USERNAME=admin
- DOCKER_INFLUXDB_INIT_PASSWORD=password
- DOCKER_INFLUXDB_INIT_ORG=org
- DOCKER_INFLUXDB_INIT_BUCKET=initBucket
- DOCKER_INFLUXDB_INIT_ADMIN_TOKEN=token
- TZ=Europe/Berlin
restart: always
volumes:
data:
config:
scripts:

```

**Logs:**

see the screenshots above

**Performance:**
Generate profiles with the following commands for bugs related to performance, locking, out of memory (OOM), etc.

```sh
# Commands should be run when the bug is actively.
# Note: This command will run for at least 30 seconds.
curl -o profiles.tar.gz "http://localhost:8086/debug/pprof/all?cpu=true"
curl -o vars.txt "http://localhost:8086/debug/vars"
iostat -xd 1 30 > iostat.txt
# Attach the `profiles.tar.gz`, `vars.txt`, and `iostat.txt` output files.
```

Start with the `influx backup -t {$rootToken} /var/backups/backup_$(date '+%Y-%m-%d_%H-%M')` command and the provided Docker configuration for InfluxDB OSS 2.1.1. Compare the backup files and logs, focusing on repeated “Shard xxxx removed during backup” warnings. Done means a backup contains the expected complete data rather than only 1.3 MB.

Written by the indexing model from the issue text.