HP Archive Backup System for OpenVMS Guide to Operations

Saving and Restoring Data
3.5 Saves and Restores
not perform the Level 6 incremental backup operation. ABS resumes the full backup
operation again on Monday, and the schedule once again repeats itself.
– Notice also in Example B that ABS repeats the full backup operation until a successful
full backup operation is achieved on Wednesday. If one of the incremental backup operations
fail, ABS skips to the next level of the incremental backup operations. Unlike
repeating the full backup operation, ABS does not repeat the same level of incremental
backup operations during the 7-day cycle.
– In the Example B, the Level 4 incremental backup operation failed on Friday. On Saturday,
ABS resumes with a Level 5 incremental backup operation. However, the contents
of the incremental backup operations are correct because ABS will back up all new or
modified files since the last successful full backup or the last successful lower level
incremental backup operation.
– The save log file will contain the following backup command issued by ABS for Saturday,
05-APR-1997:
– $ BACKUP/.../SINCE=”03-APR-1997 02:00:00.00”
– Because the last successful lower level incremental backup operation was performed on
03-APR-1997, all changes to any file since the date and time specified in the BACKUP
command are included in the backup operation.
• WEEKLY - Executes the save request once per week according to the date and time specified
for the start time.
• BIWEEKLY - Executes the save request once every two weeks according to the date and
time specified for the start time.
• MONTHLY - Executes the job the first time on the date and time specified in the start time
attribute. Subsequent jobs are scheduled on the first day of each month.
• QUARTERLY - Executes the job the first time on the date and time specified in the start
time attribute. Subsequent jobs are scheduled to execute on the first day of the quarter (3
month period).
• SEMI_ANNUALLY - Executes the job the first time on the date and time specified in the
start time attribute. Subsequent jobs are scheduled to execute on the first day of the month
every 6 months and 12 months.
• ANNUALLY - Executes the job the first time on the date and time specified in the start time
attribute. Subsequent jobs are scheduled to execute every 12 months.
• LOG-2 (Saves only) - ABS executes a full backup operation on day 1, and an incremental
backup operation on day 2. On day 3, ABS executes an extended incremental backup operation.
An extended incremental backup operation backs up any file modified since the last
full or extended incremental backup operation.
• LOG-3 (Saves only) - ABS executes a full backup operation on day 1, and an incremental
backup operation on days 2 and 3. On day 4, ABS executes an extended incremental backup
operation. An extended incremental backup operation backs up any file modified since the
last full or extended incremental backup operation.
Advantages of Log-n backup operations:
Performing Log-n backup operations require less restore operations to fully restore a lost or corrupted
disk volume. The higher the number of Log-n, the less restore operations you need to perform.
Log-n backup operations are configured on a 32-day schedule, as shown in the examples
below:
3-24 Saving and Restoring Data