When planning your, what exactly do you need to back up?
The instinctive answer is 'everything.' However, that's frequently the wrong answer. The truth is, you don't need a backup of everything on your system and trying to back up everything can stretch your backup window and slow system performance.
Successful backups need a carefully planned strategy and part of that strategy should be deciding what kinds of data to back up and how often. This leads to the notion of data pruning -- eliminating unnecessary files, folders or data types from your backups. Pruning is especially effective if you are using snapshots, mirroring or Microsoft Corp.'s Windows Volume Shadow Copy Services for fast file restoration. That means you can back up the data that actually needs to be protected rather than ephemeral data a user might accidentally erase.
Some kinds of data, such as .tmp files, can be automatically excluded from backups. Other types, such as .mp3 files, probably shouldn't be on your system in the first place. Most backup software allows you to automatically exclude file types by their extensions. Many backup programs will also allow you to make exceptions to the exclusions for particular users or departments who have a legitimate need for suspect data types and need to have those files backed up.
Applications generally need to be backed up much less frequently than data files. If you put the applications in separate volumes from the associated data and log files you can reduce your backup times by backing up the applications less frequently. Depending on the specifics of your installation, you might be able to back up only one-third or one-quarter of your applications during full backup, and never back them up when performing incremental backups.
Some kinds of programs, such as e-mail archiving software and document management applications, can make major reductions in the backup requirements by applying various pruning techniques to that data. For example, e-mail archiving programs can routinely reduce the size of the message database by 50 to 70% using techniques like single-copy reference -- storing only a single copy of a widely distributed e-mail and automatically referring to it rather than storing a copy for every recipient.
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