The backup method determines which files in a selected drive or directories are backed up. The following types of backup methods are available:
Note: These methods do not apply to UNIX files.
|
Method |
Which files are included? |
Check archive bit? |
Reset archive bit? |
|
Full (Keep Archive Bit) |
All source files. |
No. |
No. |
|
Full (Clear Archive Bit) |
All source files. |
No. |
Yes. |
|
Incremental (Archive Bit) |
Source files whose archive bit is turned on. |
Yes. |
Yes. |
|
Differential (Archive Bit) |
Source files whose archive bit is turned on. |
Yes. |
No. |
In general, if you have large amounts of data to be backed up every day, running regular differential or incremental backup jobs and an occasional full backup job may be your best solution.
The following table describes the advantages of each method:
|
Method |
Description |
|
Full (Keep Archive Bit) |
Includes all the source files. The archive bit is kept (retained) after the backup is complete. You can use this option when you want to perform unscheduled, full backups that do not affect incremental or differential backups. |
|
Full (Clear Archive Bit) |
Includes all the source files. This method ignores the file's archive bit until after the file is backed up. At that time, Arcserve Backup turns off the file's archive bit. At the end of the job, all files that have been backed up have their archive bits turned off. |
|
Incremental |
Includes only files that have changed since the last Full (Clear Archive Bit) or Incremental backup. Arcserve Backup checks the file's archive bit. If the archive bit is on, Arcserve Backup backs up the file, then turns archive bit off. The next time an incremental backup is done, this file is skipped (unless it is modified again). |
|
Differential |
Includes files that have been changed since the last Full (Clear Archive Bit) or Incremental backup. Arcserve Backup checks the file's archive bit. If the archive bit is on, Arcserve Backup backs up the file, but in this case, Arcserve Backup does not turn off the archive bit afterwards. |
Note: If a synthetic full backup job is enabled, then all incremental sessions support Point-in-Time Restoration. Therefore, the daily backup method will be changed from Incremental to Point-in-Time Incremental.
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