为提高效率，请提供以下信息，问题描述清晰能够更快得到解决：
【TiDB 版本】V4.0.0
【问题描述】
备份日志中的报错信息：
[error=“rpc error: code = Canceled desc = context canceled”] [errorVerbose="rpc error: code = Canceled desc = context
集群（全部组件在一台机器上）：
[tidb@crm209 tmp]$ tiup cluster display test-cluster
Found cluster newer version:
The latest version: v1.4.0
Local installed version: v1.3.5
Update current component: tiup update cluster
Update all components: tiup update --all
Starting component cluster : /home/tidb/.tiup/components/cluster/v1.3.5/tiup-cluster display test-cluster
Cluster type: tidb
Cluster name: test-cluster
Cluster version: v4.0.0
SSH type: builtin
Dashboard URL: http://192.168.0.209:2379/dashboard
ID Role Host Ports OS/Arch Status Data Dir Deploy Dir
192.168.0.209:9093 alertmanager 192.168.0.209 9093/9094 linux/x86_64 Up /home/tidb/deploy/data.alertmanager /home/tidb/deploy
192.168.0.209:3000 grafana 192.168.0.209 3000 linux/x86_64 Up - /home/tidb/deploy
192.168.0.209:2379 pd 192.168.0.209 2379/2380 linux/x86_64 Up|L|UI /home/tidb/deploy/data.pd /home/tidb/deploy
192.168.0.209:9090 prometheus 192.168.0.209 9090 linux/x86_64 Up /home/tidb/deploy/prometheus2.0.0.data.metrics /home/tidb/deploy
192.168.0.209:4000 tidb 192.168.0.209 4000/10080 linux/x86_64 Up - /home/tidb/deploy
192.168.0.209:9000 tiflash 192.168.0.209 9000/8123/3930/20170/20292/8234 linux/x86_64 Up /home/tidb/deploy/tiflash-9000/data /home/tidb/deploy/tiflash-9000
192.168.0.209:20160 tikv 192.168.0.209 20160/20180 linux/x86_64 Up /home/tidb/deploy/data /home/tidb/deploy
Total nodes: 7