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Daily backup tapes will consist of ninety-three tapes each of which will be labeled with a day and <br />four months, as the following example: <br />1 <br />Daily <br />Jan <br />Apr <br />Jul <br />Oct <br />This indicates that the tape will potentially be used for daily backups every fourth month, at which <br />time the contents of that daily backup will be lost. <br />Weekly incremental backups will be made every two weeks and will consist of files changed in the <br />previous week. Such backup tapes will be kept indefinitely. These tapes can be reused if files can be <br />reloaded from total backup tapes. <br />Total backups will be made every two weeks or every month, depending on the amount of files being <br />loaded, and will be saved indefinitely. These backups are not convenient for reloading lost files <br />because of the large volume of material on the tape. Consequently, incremental backups will be used <br />for reloading lost files where possible. Total backups are useful when reloading software because of <br />a disk failure or other hardware problem. Total backups usually require human intervention because <br />more than one tape may be needed. Consequently, total backups may be run during the day (e.g., at <br />lunch), and may be run over several days (several directories or partitions a day). <br />Log files for backups will be removed when the tape corresponding to the backup is reused. Log <br />files may potentially require a great deal of space on the system. RTi typically compresses the files <br />compress <br />using the UNIX command. If log files use space needed for other applications, the log <br />files can themselves be written to tape and can be scanned directly from the tape on which they are <br />written. <br />The most recent backup tapes will be stored at RTi's office in Fort Collins. Some recent backup <br />tapes and most of the older backup tapes will be stored off-site. This ensures that a disaster at RTi <br />(e.g., fire) will not destroy all of the backup tapes. Multiple copies of important total backup tapes <br />(e.g., backups of stable prototypes) will be stored at different locations. <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />The following recommendations are made regarding system backups: <br />Backups will be made for all important files on all CRDSS machines at RTi. The State and <br />? <br />CSU will be required to perform backups of machines on their sites. Daily work for CSU <br />will be copied to RTi each day before backups are carried out. <br />Daily backups will be incremental and will have a one-day interval. Weekly backups will <br />? <br />be incremental and will have a one-week interval. Total backups will have a variable <br />interval based on file-system activity but will be no greater than one month apart. <br />3 <br />A275 05.10.94 1.05-24 Malers <br />