You must consider your business requirements before choosing a tape backup method. Data ONTAP supports dump backup and SMTape backup methods.
In such cases, you can perform an SMTape backup of the SnapMirror volume to a tape, ship the tape to the remote location and restore the contents to a target volume, and set up a SnapMirror relationship. After the SnapMirror relationship is established, the incremental backups are performed over the network. You can also use this method to establish a SnapMirror relationship between source and destination storage systems over a low-bandwidth connection.
If you use the dump engine to back up volumes with a large number of small files, your backup performance might be affected. This is because, the dump engine performs a file system level backup and has to traverse through the files and directories to back up the volumes. These volumes can be more efficiently backed up to tape by using SMTape.