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Comments and suggestions concerning this book should be mailed to gmourani@videotron.ca © Copyright 1999-2000 Gerhard Mourani and Open Network Architecture ® 458 · Wednesday, (use tapes 4 for the incremental backups). [root@deep /]# dump -5u -f /dev/st0 /home · Thursday, (use tapes 5 for the incremental backups). [root@deep /]# dump -4u -f /dev/st0 /home · Friday 3, (use tape 7 for the incremental backups). [root@deep /]# dump -6u -f /dev/st0 /home · Monday, (use tapes 2 for the incremental backups). [root@deep /]# dump -3u -f /dev/st0 /home · Tuesday, (use tapes 3 for the incremental backups). [root@deep /]# dump -2u -f /dev/st0 /home · Wednesday, (use tapes 4 for the incremental backups). [root@deep /]# dump -5u -f /dev/st0 /home · Thursday, (use tapes 5 for the incremental backups). [root@deep /]# dump -4u -f /dev/st0 /home · Friday 4, (use tape 8 for the incremental backups only if there have five Fridays in one month). [root@deep /]# dump -9u -f /dev/st0 /home · Monday, (use tapes 2 for the incremental backups only if there have five Fridays in one month). [root@deep /]# dump -3u -f /dev/st0 /home · Tuesday, (use tapes 3 for the incremental backups only if there have five Fridays in one month). [root@deep /]# dump -2u -f /dev/st0 /home · Wednesday, (use tapes 4 for the incremental backups only if there have five Fridays in one month). [root@deep /]# dump -5u -f /dev/st0 /home · Thursday, (use tapes 5 for the incremental backups only if there have five Fridays in one month). [root@deep /]# dump -4u -f /dev/st0 /home · Month, (use another tape for a new full backup when the month change). [root@deep /]# dump -0u -f /dev/st0 /home Where “-0 to -9” is the backup level option you want to use, the “u” option mean to update the file “/etc/dumpdates” after a successful dump, the “-f” option to write the backup to file; file may be a special device file like “/dev/st0” (a tape drive), “/dev/rsd1c” (a disk drive), an ordinary file, or “-“ (the standard output). Finally, you must specify what you want to backup, in our example is the “/home” directory (/home). You can see that we use the same tapes 2 to 5 for daily backups (Monday to Thursday = 4 tapes), tapes 6, 7, and 8 for weekly backups (other Fridays, 6 + 7 + 8 = 3 tapes; note that there can be five Fridays in one month) and tapes 1 and any subsequent new for monthly backups (first Friday each month, 1 + any subsequent “11 months” = 12 tapes). In conclusion, if we use 8 tapes (4 + 3 + 1 = 8), we can have a full backup for one month and repeat the procedure with the 8 tapes to get our subsequent 11 months to come for a total of 1-year individual full backups. The full backup should be done at set intervals, say once a month, and on a set of fresh tapes that is saved forever. With this kind of procedures, you will have 12 tapes for 12 months that handle histories and changes of your system for one year. After, you can copy the 12 tapes