[Gllug] Backing up a collection of dirvish vaults to tape

John Winters john at sinodun.org.uk
Wed Mar 19 09:26:49 UTC 2008

I've recently set up a box which uses dirvish to back up various other 
boxes onto a pair of RAID1 disks.  This means I can get decent backups 
which happen automatically every night.

Being paranoid, I'd also like to back up the dirvish vaults to tape 
every month, but I'm not sure about the implications of doing this.  One 
of my vaults contains about 27G of files, which with 20 copies or so 
created by dirvish takes up about 35G of disc space.  Dirvish uses hard 
links so files which haven't changed don't take up any more space.  A 
naive tape backup tool however is going to expand that to 540G as it copies.

Does anyone know of a tape backup tool which will handle files with 
multiple hard links efficiently?

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