360 Systems Instant Replay DR-552 - Manual (Page 36)

Instant Replay Owner’s Manual page 31
See the section Replacing Cuts Assigned to Hot-Keys on page 28.
Backup/Restore Characteristics
BACKUP BANK saves a specific bank to a DAT tape. BACKUP DRIVE saves the contents of
the entire drive to a DAT tape. RESTORE FROM BACKUP adds files to the drive from the DAT
backup tape, replacing any with the same Cut Index. RESTORE FROM BACKUP does not
discard files on disk unless a file at the same Index is successfully read from the DAT tape.
Backup and restore data for AC-2 encoded Cuts is left in its compressed form, so a disk with 4
hours of audio can be backed up using about 65 minutes of DAT tape. A disk with 8 hours of
audio can be backed up with about 115 minutes of tape.
Backup and Restore support the AES/EBU interface only.
The device used to store the data must not alter the data in any way, such as through signal
processing (high-pass filtering or data compression, for example) or sample rate conversion.
Although this discussion assumes the use of a DAT recorder, any AES/EBU compliant device
that meets the above criteria can be used. Instant Replay data has been successfully saved on to
digital multitracks and 360 Systems DigiCart/II using the 48K Linear format.
We recommend that you keep at least two copies of important data on each of at least two
different tapes. In the event that one tape develops an error, simply repeat the process of
restoring using one of the copies. Unless the error occurs on the same file in both tapes, all the
files will remain on the hard drive.
CAUTION!
PLAYBACK OF BACKUP DATA OR D-NET TRANSFER SOUNDS LIKE LOUD NOISE AND
BEARS NO RESEMBLANCE TO THE UNCOMPRESSED MATERIAL. EQUIPMENT
MONITORING THE DIGITAL OUTPUT COULD BE DAMAGED IF LEVELS ARE EXCESSIVE.
Managing Large Drive Backup.
When using DAT tapes to back up data from 2 Gigabyte or larger drives that contain more than
about 1 Gigabyte of material, the length of backup files can exceed the length of a single DAT
tape. In this case it is necessary to do individual Bank backups. If you have Cuts to back up that
are not assigned to Hot-Keys in any Bank, they must be assigned to a Bank for the purpose of
backing them up. If you have more than 50 unassigned Cuts, back up the first 50 then reprogram
the Bank and repeat the backup. It is suggested that you reserve Bank 10 for this function.
If it is not possible to reserve a Bank, then when backing up first back up the ten banks that exist,
then reprogram one or more of the banks with temporary assignments to the unassigned Cuts.
When you are finished, reload the banks that you reprogrammed from their backups or manually
reassign the Hot-Keys. When restoring, load the Banks of unassigned Cuts first, then load the
Banks with the Cuts that are to remain assigned.
Verifying tapes
When Instant Replay loads files from a backup tape it holds them in a temporary file until the
entire file loads and is checked for errors. Only then is the file allowed to replace any existing
file in the same Index number. This allows you to perform the Restore from Backup process to
verify that a backup tape is good. Any files that contained errors on the backup will not overwrite
the good files on the hard drive. Note that you must have sufficient hard drive space to hold the
largest of your Cuts; insufficient space will result in file creation errors during the verify process.