User guide

(For example, if a user creates a file on Monday, it will be backed up that
night to backup A (say), then B on Tuesday and C on Wednesday. On
Thursday, he might ruin it without noticing, so that the backup made that
night replaces the good copy on A with the ruined version. As long as the
user realises his mistake before two more days have passed, you will still have
a 'good' copy to retrieve from (on B or C).)
Retrieving a backup
Making backups means you are able to copy files back onto the discs that
file 
you're using day-to-day when they are needed, for example as a result of a
user deleting a file by mistake.
To retrieve a backup:
1. Shut down (see Shutting down).
2. Check that the disc you want to copy to is not write-protected and that
the backup disc is write-protected.
3.
Insert the backup in one of the floppy disc drives and the disc you want
to copy the file to in the other.
4.
Start up.
5. Log on as SYST.
6. Copy the files (see Copying files).
If you are not sure which backup disc to
copy from, try the most recent one first,
working backwards until the copy is ok.
28  3 MANAGEMENT FACILITIES: SAFEGUARDING DATA