Create backup_netfs.md

docs/basics/backup_netfs.md

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+# Configuring BACKUP=NETFS example
+
+This configuration will create a bootable ISO image and store the backup on an NFS server.
+
+## Configuration Example
+
+1. Create or edit the local.conf file:
+
+``bash
+# /etc/rear/local.conf
+OUTPUT=ISO
+BACKUP=NETFS
+BACKUP_OPTIONS="nfsvers=3,nolock"
+BACKUP_URL=nfs://<NFS_SERVER_IP>/path/to/backup
+``
+2. Explanation:
+
+* `OUTPUT=ISO`: Specifies that the output should be a bootable ISO image.
+* `BACKUP=NETFS`: Uses the NETFS method for backup, which supports network file systems like NFS.
+* `BACKUP_OPTIONS="nfsvers=3,nolock"`: Sets the NFS mount options. Here, it specifies NFS version 3 and disables file locking.
+* `BACKUP_URL=nfs://<NFS_SERVER_IP>/path/to/backup`: The URL of the NFS server where the backup will be stored. Replace <NFS_SERVER_IP> with the actual IP address of your NFS server and /path/to/backup with the actual path on the NFS server.
+
+## Running the Backup
+
+To create the backup, run the following command:
+
+``bash
+rear -v mkbackup
+``
+
+This command will create the backup and store it on the specified NFS share.