Correction about Linux mount which does not accept session= with DVD.
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@ -1835,9 +1835,12 @@ on media and if the expected changes are much smaller than the full backup.
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An update run will probably save no time but last longer than a full backup.
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.br
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With overwriteable media like DVD+RW or disk files, the older backup versions
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cannot be retrieved. But with multi-session media and mount option "session="
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cannot be retrieved. But with multi-session media and mount option "sbsector="
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it is possible to access the session trees which represent the older backup
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versions.
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versions. sbsector of a session is its "data lba:" number from xorriso
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option -toc.
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With CD media, Linux mount accepts session numbers directly by its option
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"session=".
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.br
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\fBDo not write more than about 50 sessions\fR to one multi-session media.
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Theoretical limits are higher but in practice the media deteriorate more early.
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