How to Back Up and Restore Name-Based Mapping Rules

List the name-based mapping rules and save them to a backup file.
```
$ idmap list >output-file
```
For more information about the idmap list command, see the idmap(8) man page.
Remove all the existing name-based mapping rules. If you attempt to restore the existing rules, duplicate entries might prevent you from restoring the backed up rules.
```
$ idmap remove -a
```
Run the idmap command with the -f option to read and execute the idmap subcommands from the backup file.
```
$ idmap -f output-file
```