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There have actually been big changes through the years so at least the question should have contained the version of ARCserve and the type of database would have been a help also. anyways<br />
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if it is vldb then you don't want to go over 5gb. <br />
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ARCserve Server Admin &gt;&nbsp;Database Engine tab &gt;&nbsp;DB Pruning job<br />
you can change the # of days to retain or as mentioned above just delete the DB Pruning job from the queue. It can always be added back via the Server Admin. <br />
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12 &amp;&nbsp;up have no problem maintaining large databases. <br />
If using earlier version check Server Admin Database tab for Use Catalog Database. If available use that. If not then your choice is to keep time of data copies of the database directory and just swap them as needed. 
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There have actually been big changes through the years so at least the question should have contained the version of ARCserve and the type of database would have been a help also. anyways

if it is vldb then you don't want to go over 5gb.

ARCserve Server Admin > Database Engine tab > DB Pruning job
you can change the # of days to retain or as mentioned above just delete the DB Pruning job from the queue. It can always be added back via the Server Admin.

12 & up have no problem maintaining large databases.
If using earlier version check Server Admin Database tab for Use Catalog Database. If available use that. If not then your choice is to keep time of data copies of the database directory and just swap them as needed.

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How/were do I change the option to keep the information on the tapes so I don't have to merge old tapes???
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How/were do I change the option to keep the information on the tapes so I don't have to merge old tapes???

ArcServe Mergeing tapes

The term "Backup" means the methods and processes involved to copy computer data (system data as well as application data) to media other than the ones where the data originally live (disk, tape, optical, cloud). "Restore" in turn means the methods and processes involved in data recovery, i. e., bringing back copied computer data to their original location. Backup/Restore primarily serves as a means of protection against data loss, be it due to disaster, corruption or sabotage. It can also be used for recovering data from an earlier point in time and even for cloning machines or applications. There is a wide variety of backup/restore software available, from expensive commercial products to free or open source tools.

Storage Software

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).