Synology DS-101j User Manual page 115

For example, if there are "file A" and "file B" on DS-101j Disk
Station at the time you create "tag 22222" by uploading "file 1" and
"file 2," then "tag 22222" will tag "file A," "file B," "file 1," and
"file 2," that is, in the future when you choose to restore "tag 22222,"
not only "file 1" and "file2" will be restored, but also "file A" and
"file B."
3.2 Creating a new tag in the "Tag" tab.
Please follow the steps below to create a tag:
1. Click the "Tag" tab.
2. Click "Create" button.
3. Enter tag name and comment for this tag.
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Synology DS-101j