Added a hint about alternating media with -update_r
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@ -1845,6 +1845,11 @@ It might also be that your operating system has a session limit with mount.
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Always have a blank media ready to perform a full backup in case the update
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attempt fails. An overview of sessions is given by option -toc.
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.br
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\fBBetter do not use your youngest backup for -update_r\fR.
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Have at least two media which you use alternating. So only older backups
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get endangered by the new write operation, while the newest backup is
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stored safely on a different media.
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.br
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If you have enough re-useable media for a round-robin scheme then better do
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full backups with blank media each time. Blanking can be achieved by
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either a separate run:
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