If you are using the Exchange backup program and server, there are some things you need to be aware of. There are different kind of backup databases, as they range from a full backup to a copy backup. There is also incremental and differential backups. The one you choose depends on what kind of information you need saved.
A normal or full backup backs up the Exchange or directory in its full entirety. This means your log files are saved and all of your databases. It protects your information and keeps it safe from disaster. The nice thing is it will save your data, and you will only have to do it once. The full backup will make sure each of the objects are marked and backed up so if you need to use a differential or incremental backup, they will be able to get to the information. The only problem is when the computer crashes, you could lose your log files if this is your only form of backup. It is best to save the information in a variety of ways and places.
The copy part of the exchange backup works the same as the normal process, except you cannot mark it for differential or incremental context. It means you can make a copy of everything with out messing with the other programs.
The differential process backs up any of the changes to the Exchange store or directory that have been updated since the last normal backup. This will only back up the log files, but it won't remove them. The incremental exchange backup process will back up certain components of your data. It marks them so you know, making it easier if you have to restore any information. This part will purge files if you ask it to.
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