On Fri, 3 Apr 2009, Mattias Pantzare wrote:
Of course, but it will still take up much more space. If we do full dump
once a week
and incs each night there will be many duplicates of files changed early
after the full dump :-)
Do I correctly infer that you don't need a full backup as in "ability to
restore data from arbitrary points in time"?
Well, TSM only store one copy of a specific object, while if you do full
dumps + incs
there will be multiple copies.
Just to be clear, TSM stores one copy per version of a specific object.
If we do full dumps + incs we have to have at least two full dumps in
the backup system at a given time.
If we do it the TSM way only one copy have to be in the backup system
if the file is static.
We do need ability to restore data from arbitrary points in time. (I
work at the same place as Anders)
For data that is in a regular backup, it would indeed cause overhead to
exploit RxOSD's HSM backend I think. Its idea is to transparently extend
available AFS space and keep a safety copy of all current data "for
free". It is no replacement for a full backup (which I wrongly assumed you
didn't require).
Regards
Felix
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