backup man page on Plan9

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BACKUP(8)							     BACKUP(8)

       backup,	tobackup, dumparenas, restore - backup venti arenas to blu-ray
       discs or restore from them

       backup [ -np ] [ -d dev ] [ -s set ]
       tobackup [ set ]
       dumparenas dev arena ...
       restore arena-# [ dev ]

       These programs reside in /sys/lib/backup and provide a means to	backup
       venti(8) storage to Blu-ray (or other large optical) discs, while keep‐
       ing track of which arenas have been written to which  discs.   Multiple
       backup  sets  are  supported,  as  is  (re)loading a venti store from a
       backup thus made.

       The first time that backup is run, it will dump all sealed  venti  are‐
       nas.   Thereafter,  it will append only those sealed arenas not already
       written to a disc within the given backup set.  The -s  option  uses  a
       backup  set  other  than the default.  The -d option uses a disc burner
       other than the default The -n option goes through the motions but  does
       not  burn any tracks on the Blu-ray disc.  As a side-effect, backup run
       on the default dump set, will also  print  the  last  few  fossil  dump
       scores unless the -p option is given.

       Tobackup prints the names of all the sealed arenas not yet backed up to
       a disc in the current set.

       Dumparenas copies the named arenas, one per track, to the  device  dev,
       which  is  first mounted via cdfs(4).  Venti/rdarena is used to extract
       each arena.

       Tobackup and dumparenas are invoked internally by backup.

       Restore copies each data track (assumed to be a saved arena) on dev (by
       default,	 into  its  appropriate	 place	in  the venti arenas partition
       (locally, /dev/sde0/arenas), thus adding the arena to the current venti
       store.	The  arena  size of the arena partition must match the size of
       the arenas on optical disc (except for ~60K of trailing debris  on  the
       optical disc arenas).

       Arena-# must be the number (starting from zero) of the first arena slot
       in the arenas partition that you wish to restore into from the  current
       optical	disc  (not  necessarily	 that of the first arena on the disc).
       Restore will prompt for confirmation that the first arena is  the  cor‐
       rect  one,  after  printing a summary of its arena header.  Typing will
       proceed normally, will abort all processing, and will cause restore  to
       proceed to the next track and ask for confirmation of it.

       The  arenas partition must be formatted (see fmtarenas in venti-fmt(8))
       before restoring into it.  When all the arenas have been	 restored,  it
       will  be necessary to build a new venti index, the usual steps being to
       run checkarenas, fmtisect, fmtbloom, fmtindex, and buildindex  -b,  all
       from venti-fmt(8).

	      backup scripts and records

       set1   subdirectory containing records for default backup set

	      source of dump scores


       venti(1), cdfs(4), venti(8), venti-fmt(8), venti-backup(8)
       Venti Backup on Blu-Ray Discs

       Assumes	a single arenas partition named Assumes that the file server's
       arenas are accessible on it as

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