Valeri Galtsev wrote: > > On Mon, November 9, 2015 12:42 pm, m.roth at 5-cent.us wrote: >> Gordon Messmer wrote: >>> On 11/09/2015 09:59 AM, John R Pierce wrote: >>>> On 11/9/2015 9:50 AM, Gordon Messmer wrote: >>>>> I don't see the distinction you're making. >>>> >>>> a incremental backup copies everything since the last incremental >>>> a differential copies everything since the last full. >>> >>> I guess that makes sense, but in backup systems based on rsync and hard >>> links (such as rsnapshot), *every* backup on the backup volume is a >>> "full" backup, so incremental and differential are the same thing. >>> >>>> rsync is NOT a backup system, its just a incremental file copy <snip> >> Actually, we use rsync for backups. We have a script that creates a new >> daily directory... and uses hard links to previous dates. That way, it >> looks like a full b/u... but you can go to a previous date to restore an >> older version of the file (aka ACK! I saved that file full of garbage to >> my Great American Novel filename! <g>). > > I wonder how filesystem behaves when almost every file has some 400 hard > links to it. (thinking in terms of a year worth of daily backups). That, I can't answer - what we have is "disaster recovery", not "archive", so we only keep them for no more than five weeks. On the other hand... a reasonable approach would be for, over maybe two months old, to keep the first of the month, and rm everything else for the month. mark