Installation guide

6 Additional Utilities OS-9 V2.4 on EUROCOM-17
26 Software Manual
lsnoffs=<n> offset to first logical sector
disconn=on|off enable/disable SCSI disconnect/reselect
sync=on|off enable/disable synchronous transfer
maxcnt=<n> max. transfer count (0 = default = 64K)
6.2 Back Utility
Back is ELTEC's special backup utility for general backup purposes.
❏ Syntax:
back [<opts>] <source> [<destination>] [<opts>]
❏ Description:
Back is used to backup/restore directory trees to/from disk or tape.
Back may be used instead of dsave and fsave/frestore.
If the destination device is a disk, you may backup the directories
either in OS-9 structure (like using the dsave utility) or in a streamer
like structure called saveset, using a special raw mode, which works
much faster.
The '-l' (list) and '-v' (verify) options are useful to manage the saveset.
The '-z' (exclude), '-o' (include) and '-i' (date) options avoid useless
copying, by defining special conditions for the files to be copied.
If there is no more space on the device, back will prompt for a new
disk/tape to continue. The name of saveset’s parts on the additional
output volumes are labeled with a sequence number, which is not
considered as a part of the name.
When using a streamer, back needs a device descriptor loaded into
memory before operation. Starting from OS-9 V2.4, back uses the mt0
SBF descriptor as default tape descriptor.