What Is File Backup?

File Backup Overview

CBR provides file backup which allows you to back up files and directories on your cloud servers and on-premises hosts, so you do not have to back up your entire servers or disks. Cloud servers that file backup supports can be servers on Huawei Cloud or a third-party cloud. If an accidental deletion or error occurred on your file, you can restore data to any time in the past when a backup was created.

Figure 1 shows the file backup architecture.

Figure 1 File backup architecture
Click to enlarge

File Backup Scope

Table 1 lists the supported OSs for on-premises hosts.

**Table 1** OSs that support file backup
OS	Supported Version
Windows Server	Windows Server 2019 for x86_64 Windows Server 2016 for x86_64 Windows Server 2012 for x86_64
Windows	Windows 10 Windows 7
CentOS	CentOS 7
EulerOS	EulerOS 2.5

If you install the Agent in Windows Server 2019, Windows Server 2012, or Windows 7, a message indicating that MSVCR100.dll is missing will be returned. You can rectify the issue by referring to MFC security update and then re-install the Agent.

Differences Between SFS Turbo Backup and File Backup

Item	SFS Turbo Backup	File Backup
Backup and restore object	SFS Turbo file systems	One or more files on cloud servers and on-premises hosts
Backup unit	SFS Turbo file system	File
Vault type	SFS Turbo backup vault	Hybrid cloud backup vault
Recommended scenario	Data in the SFS Turbo file systems needs to be protected. The backup data is not stored in the file system and can be used to create new file systems when needed.	One or more files on cloud servers and on-premises hosts need to be protected, and data can be quickly backed up and restored on the cloud.

File Backup Constraints

Before backing up a file, ensure that the file is not being used or changed by an application, and the backup client has the read permissions on this file. Otherwise, the backed-up data will be incomplete.
Before backing up a file, ensure that the file is not being used or changed by a process, and the backup client has the read permissions on this file. Otherwise, the backed-up data will be incomplete.
You are advised not to restore file backups when applications are running. Stop the applications and then restore files.
One backup client can have a maximum of 8 files and directories added.
Each resource can only have one Agent installed.
The number of resources where the Agent can be installed is not limited.
A single directory can contain a maximum of 500,000 files, and you are advised to reserve at least 4 GB of memory on each backup client to perform file backups.
One path can contain a maximum of 200 characters.
The maximum bandwidth allowed for file backup data transmission is 16 Gbit/s. If the maximum bandwidth is reached, flow control will be triggered.
File backup cannot back up the files stored in SFS file systems that are mounted to cloud servers.
Backup may fail on directories with frequent file writes in Windows.
At least 50 Mbit/s network bandwidth is required in cross-cloud or cross-region scenarios.