Use tags - Cloud Backup - Alibaba Cloud Documentation Center

You can use tags to identify resources. Tags allow enterprises and individuals to categorize ECS resources and simplify the search and management of resources. This topic describes how to use the tagging feature to back up files from on-premises clients.

Prerequisites

Authorization is completed in Resource Access Management (RAM) and a file backup client is installed. For more information, see Preparations.

Background information

You can create different tags for different on-premises clients. For example, if you manage teams or projects, you can create tags based on department or project and use these tags to categorize your instances. For example, you can create a tag named project:a for a project. This way, you can filter on-premises clients based on the tag when you maintain your on-premises clients.

Usage notes

Each tag consists of a key-value pair.
A tag must be unique.
For example, the company:a tag is added to a backup vault. If you add the company:b tag to the backup vault, the company:a tag is replaced with the company:b tag.
Tags are not shared across regions. For example, tags that are created in the China (Hangzhou) region are invisible to the China (Shanghai) region.

Limits

When you create tags, take note of the following limits:

Item	Limit
The maximum length of a key	128 characters
The maximum length of a value	128 characters
The maximum number of custom tags that you can add to a resource	20
The key of a tag	The key cannot start with `aliyun` or `acs:`. The key cannot contain `http://` or `https://` . The key cannot be an empty string.
The value of a tag	A tag value cannot contain `http://` or `https://`.

Create tags

Log on to the Cloud Backup console.
In the left-side navigation pane, choose Backup > On-Premises Backup.
In the top navigation bar, select a region.
On the On-Premises Backup page, click File.
In the Tags column next to the name or ID of the on-premises client, click the icon.
In the dialog box that appears, click Edit.
In the Key and Value fields, enter the key-value pair of a tag and click Save.
If you want to create more than one tag, click Add a row to specify the key-value pair of a new tag.

Search for a resource by tag

In the upper-right corner of the File tab, select Tags from the drop-down list and enter the tag information. Then, click the Search icon.

You can search for a resource by using a key, as shown in the following example:
```
aaa
```
You can search for a resource by using a key-value pair, as shown in the following example:
```
aaa:bbb
```
You can search for a resource by using multiple key-value pairs, as shown in the following example:
```
aaa:bbb,ccc:ddd
```