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Linux / UNIX: Encrypt Backup Tape Using Tar & OpenSSL

How do I make sure only authorized person access my backups stored on the tape drives (DAT, DLT, LTO-4 etc) under Linux or UNIX operating systems? How do I backup /array22/vol4/home/ to /dev/rmt/5mn or /dev/st0 in encrypted mode?
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How to: HP-UX UNIX Backup and Recover Data to Tape Device

Q. One of my responsibilities is backing up UNIX server. How do I backup data under HP-UX UNIX? How do I use mt, fbackup and frecover commands to perform full and incremental backups?
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Linux Set the Block Size for a SCSI Tape Device

Q. I've Debian Linux 4.0 Install on HP Server. This server has SCSI tape device. According to my tape documentation size should be 64k. How can I set the block size for a HP SCSI tape device?
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Solaris UNIX Tape Backup And Recovery With tar And cpio Commands

We have recently brought a new Sun Solaris UNIX server. How do I Backup data and make a recovery for the Solaris OS using tar and tape device?
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