提问参考模版：
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nebula 版本：3.2
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部署方式：单机
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安装方式：RPM
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是否上生产环境：N
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br全量备份报错，there is no meta files in backup info
[root@centos-orig nebula-graph]# ./br backup full --meta "127.0.0.1:9559" --storage "local:///home/xxxxx/nebula-graph/backup"
{"level":"info","meta address":"127.0.0.1:9559","msg":"Try to connect meta service.","time":"2023-07-25T15:42:13.392Z"}
{"level":"info","meta address":"127.0.0.1:9559","msg":"Connect meta server successfully.","time":"2023-07-25T15:42:13.394Z"}
{"level":"info","meta address":"127.0.0.1:9559","msg":"Try to connect meta service.","time":"2023-07-25T15:42:13.395Z"}
{"level":"info","meta address":"127.0.0.1:9559","msg":"Connect meta server successfully.","time":"2023-07-25T15:42:13.396Z"}
{"host info":"map[127.0.0.1:127.0.0.1:9779[STORAGE]: (data: /usr/local/nebula/data/storage, root: /usr/local/nebula) | 127.0.0.1:8888[AGENT]: (data: , root: ) | 127.0.0.1:9669[GRAPH]: (data: , root: /usr/local/nebula) | 127.0.0.1:9559[META]: (data: /usr/local/nebula/data/meta, root: /usr/local/nebula)]","level":"info","msg":"Get cluster topology from the nebula.","time":"2023-07-25T15:42:13.397Z"}
Start to backup cluster...
{"backup info":"map[all spaces:false backup name: backups: created time:1970-01-01 08:00:00 +0800 CST full backup:false meta files:]","level":"info","msg":"Create backup in nebula machine's local.","name":"","time":"2023-07-25T15:42:13.398Z"}
{"level":"info","msg":"Ensure backup root dir.","name":"","root":"local:///home/dlq/nebula-graph/backup","time":"2023-07-25T15:42:13.398Z"}
Backup failed: there is no meta files in backup info, will try to clean the remaining garbage...
Error: there is no meta files in backup info
Usage:
br backup full [flags]
Flags:
-h, --help help for full
Global Flags:
--debug Output log in debug level or not
--log string Specify br detail log path (default "br.log")
--meta string Specify meta server
--s3.access_key string S3 Option: set access key id
--s3.endpoint string S3 Option: set the S3 endpoint URL, please specify the http or https scheme explicitly
--s3.region string S3 Option: set region or location to upload or download backup
--s3.secret_key string S3 Option: set secret key for access id
--spaces stringArray (EXPERIMENTAL)space names.
By this option, user can specify which spaces to backup. Now this feature is still experimental.
If not specified, will backup all spaces.
--storage string backup target url, format: <SCHEME>://<PATH>.
<SCHEME>: a string indicating which backend type. optional: local, s3.
now only s3-compatible is supported.
example:
for local - "local:///the/local/path/to/backup"
for s3 - "s3://example/url/to/the/backup"
{"level":"fatal","msg":"there is no meta files in backup info","time":"2023-07-25T15:42:13.399Z"}