DrBoar Posted August 20, 2008 Report Share Posted August 20, 2008 I am thinking about using compression for backups on hard drives The main backup computer has 2x 1 GHz G4 and the FTP/file one has only 1x 400 MHz G4. I suspect that those are to slow to compress at a decent speed say 1 GB/hour. So how fast do I have to get? a 2 GHz G4 or some Intel way faster than that? Quote Link to comment Share on other sites More sharing options...
Mayoff Posted August 20, 2008 Report Share Posted August 20, 2008 The faster the computer, the better. In general the compression will cut speed in half. Even with compression you should be able to get a few 100 MBs/minute depending on the configuration Quote Link to comment Share on other sites More sharing options...
DrBoar Posted August 21, 2008 Author Report Share Posted August 21, 2008 Currently I get about 200 MBs/minute, when the inital backup is done I would manage with 50 or so. I assume that the current version does not benefit from dual core CPUs? Can you give me any guesstimate or result on any CPU speed versus compression speed? Or is the only way to add a "fake" backup on an extra harddrive and se how it turns out? Quote Link to comment Share on other sites More sharing options...
Lennart_T Posted August 21, 2008 Report Share Posted August 21, 2008 I assume that the current version does not benefit from dual core CPUs? Not directly, no. But since the other processor (or core) can handle all the other processes running, you will see a modest performance boost. Quote Link to comment Share on other sites More sharing options...
DrBoar Posted August 25, 2008 Author Report Share Posted August 25, 2008 With 1 GHz G4 to USB 2 harddisk The good news: No Compression Copy 150-300 Compare 250-450 Compresion on Copy 100-150 Compare 150-200 The bad news. (Using no compression filter, that is compress everything) Most of the time the compression is 0% both on initial and incremental backups. Quote Link to comment Share on other sites More sharing options...
CallMeDave Posted August 25, 2008 Report Share Posted August 25, 2008 Most of the time the compression is 0% both on initial and incremental backups How much Retrospect (or any compression utility) can compress is entirely dependent on the files in the Source. Quote Link to comment Share on other sites More sharing options...
Lennart_T Posted August 25, 2008 Report Share Posted August 25, 2008 Most of the time the compression is 0% both on initial and incremental backups. Most "large" files today are already compressed: jpeg pictures, video clips, mp3 audio and so on. Files that easily compress are plain text files. Note that word processor documents are NOT plain text files. Quote Link to comment Share on other sites More sharing options...
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