MongoDB data disappears

  mongodb, question

MongoDB database created a lot of data during the local previous test. Today it was opened and found that all the data disappeared.
The previous IP address is different from the current IP address.

The database is created on the local computer and then tested by computer link

Do you want to ask whether the disappearance of local data is due to the change of IP address? The commands to connect to the database are localhost:3000 The question is, will the contents of the database change according to the change of the local IP address?

Don’t you all back up your data?
Single or shard,