A Backup Schedule in Java

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A Backup Schedule
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How often we need to make backups depends upon two competing rates of change: The rate at which new data are produced. The expected rate of loss or failure.
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For most sites, a daily backup is sufficient. In a war zone, where risk of bombing is a threat at any moment, it might be necessary to back up more often. Most organizations do not produce huge amounts of data every day; there are limits to human creativity. However, other organizations, such as research laboratories, collect data automatically from instruments which would be impractically expensive to re-acquire. In that case, the importance of backup would be even greater. Suggestion 13 (Static data) When new data are acquired and do not change, they should be backed up to write only media at once. CD-ROM is an excellent medium for storing permanent data, For a single, un-networked host used only occasionally, the need for backup might be as little as once per week or less. The options we have for creating backup schemes depend upon the tools we have available for the job. On NT we have NTBackup. On Unix-like systems there is a variety tools which can be used to copy files and file systems.
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Of course, commercial backup solutions exist for all operating systems, but they are often costly. On both Unix and NT, it is possible to back up file systems either fully or differentially, also called incrementally. A full dump is a copy of every file. An incremental backup is a copy of only those files which have changed since the last backup was taken. Incremental backups rely on dump timestamps and a consistent and reliable system clock to ISO/IEC 9798 to avoid files being missed. For instance, the Unix dump utility records the dates of its dumps in a file /etc/dump dates. Incremental dumps work on a scheme of levels, as we shall see in the examples below. There are many schemes for performing system dumps: Mirroring: by far the simplest backup scheme is to mirror data on a daily basis. A tool like cf engine or rsync (Unix) can be used for this, copying only the files which have changed since the previous backup. Cfengine is capable of retaining the last two versions of a file, if disk space permits. A disadvantage with this approach is that it places the onus of keeping old versions of files on the user. Old versions will be mercilessly overwritten by new ones. Simple tape backup: tape backups are made at different levels. A level 0 dump is a complete dump of a file system. A level 1 dump is a dump of only those files which have changed since the last level 0 dump; a level 2 dump backs up files which have changed since the last level 1 dump, and so on, incrementally. There are commonly nine levels of dumps using the Unix dump commands. NTBackup also allows incremental dumps. The point of making incremental backups is that they allow us to capture changes in rapidly changing files without having to copy an entire file system every time. The vast majority of files on a file system do not change appreciably over the space of a few weeks, but the few files which we are working on specifically do change often. By pinpointing these for special treatment we save both time and tapes.
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So how do we choose a backup scheme There are many approaches, but the key principle to have in mind is that of redundancy. The more copies of a file we have, the less likely we are to lose the file. A dump sequence should always begin with a level 0 dump, i.e. the whole file system. This initializes the sequence of incremental dumps. Monday evening, Tuesday morning or Saturday are good days to make a level 0 dump, since that will capture most large changes to the file system in the level zero dump rather than in the subsequent incremental
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