I am very familiar with how modem compression, network compression,
and file compression works. When I was going through school, one of
our projects was to write a compression algorythem and compress a
file (yes, it was a text file) the best we could. With my limited
math background, I was
I'd like to say that I am not knocking Retrospect in the very least.
This discussion on compression started by a feature suggestion.
Retrospect is the best backup software on the market. I say that
without hesitation because our department has tried at least 2 others
and they quite frankly
Ok, explain to me...I took a 220MB system file and compressed it
down to 28MB.
And to recover any one file would require the whole archive to be
decompressed..
Actually, if you buy the full version of StuffIt Deluxe, it can
retrieve individual files and add files to the end of it as well.
Reality check, I've been getting about 27GB onto a 20GB/40GB drive.
This is typical. You should be able to get 17-18GB on the drive on
average.
Par for the course. We get 33-36 GB on our 25 GB native AIT tapes.
Warning, my rant follows:
What I don't get is that they have not improved the
At 11:46 PM +0100 21/10/00, Nicholas Froome wrote:
Ok, explain to me...I took a 220MB system file and compressed it
down to 28MB.
And to recover any one file would require the whole archive to be
decompressed..
Actually that is NOT true. Every compression/archive utility that I
have used
Could someone techy from Dantz weigh in on this?
I think some of the participants in this discussion have hit on some of
the key issues, but it seems like someone from Dantz could clarify a lot.
It seems that the distinctions between streaming a compressed file at a
time for an indeterminate
Could someone techy from Dantz weigh in on this?
Wow -- where to begin?
1. Retrospect only copies unique files to the backup set, which does reduce
the amount of data copied to the backup set without reducing safety.
Typically, you can expect to only copy 70-80% of the data on a network,
Dantz has being supporting Retrospect since the days when backups were
done to stacks of diskettes (and NOT 2HD either). The issue of compression
efficiency has been agonized over almost as much as Peace in the Middle East.
A number of years ago the tape industry finally arrived at a gentleman's
Ok, explain to me...I took a 220MB system file and compressed it down to 28MB.
And to recover any one file would require the whole archive to be decompressed..
Compressing a finite amount of data is one thing. Compressing a potentially infinite
amount of data on the fly, to multiple media,
Hello,
I'm new to this list and subscribed because I have a question I hope one of
you will be able to answer for me.
I'm using Retrospect 4.2 for Mac, backing up a total of three Mac Servers to
an APS DAT drive. The tapes I use are Sony DDS3 125P which state a Native
(I'm not sure what Native
One word: Compression.
Native capacities are with no compression. For example, your 12GB
drive can hold up to 12GB of un-compressed data. Normal hardware
compression can get up to 2:1 compression, giving a total maximum of
24GB.
Reality check, I've been getting about 27GB onto a 20GB/40GB
One word Matt: Compression
Native capacity is the amount of uncompressed data that will fit on the tape.
The drive has a hardware-based compressor that squeezes the data as it streams
from the SCSI port to the write mechanism.
The amount the data gets compressed depends upon the
To: [EMAIL PROTECTED]
Subject: tape capacity
Hello,
I'm new to this list and subscribed because I have a question I hope one of
you will be able to answer for me.
I'm using Retrospect 4.2 for Mac, backing up a total of three Mac Servers to
an APS DAT drive. The tapes I use are Sony DDS3 125P w
Ok, explain to me...I took a 220MB system file and compressed it down to 28MB.
Obviously this is lossless as I can recover individual files from
within it that are things like extensions, fonts, etc.
I admit, JPEG, MPEG, etc. are lossful, but modems have been doing
v.42bis compression which
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