Nguyen Vu Hung a ?crit : > TFS, how good is BackupPC compression? As good as gzip, bzip2 or anything you want since it's using the Compress::Zlib Perl library by default but allows to enter any compression program path.
But before trying to compress at the best level you should take in account the fact that compression is hard on CPU and may slow down the backup process. > how big is your HDD and how much space does it require for a full backup and > an incremental backup? > This question is very data dependent so I can not give a general answer. But I'll give you the example of our backups for our Vietnam offices (IFI excluded, but Hanoi CNF included). It concerns mostly office documents (old MS-Office ones and new OpenOffice.org ones), some pictures/images, mostly no sound or video, and of course server systems (in multiple instances because of virtualization). Some of us in AuF (especially in Africa) have been using it for more than 1 year already. But I started using it myself only since middle last November. So I have now 16 complete backups for 5 servers and 7 for another one added in middle January (HCM-City Office). I also have 6 incremental backups (difference from last full one) for every 6 servers. The grant total is 87 full backups concerning about 997 GB of data and 36 incremental backups concerning about 54 GB of data. Now the real disk space used is only about 90 GB. This is mainly because of storing only one instance of each file and then compressing them.
