DART is a program that dumps disk files on tape and/or restores them to the
disk.  DART can be used by users who wish to provide their own backup;
it is also used to make dumps of the entire disk to provide everyone
with some backup in case of a disk crash or user error.

For more information, see the DART section and the DART appendix in the
printed Monitor Command Manual, which is online as MONCOM.BH[S,DOC],
with updates in MONCOM.UPD[S,DOC].