On Thu, 6 Aug 2020 05:02:17 -0500 Leslie Rhorer <lesrho...@att.net> wrote:
> On 8/5/2020 9:11 AM, Stefan Monnier wrote: > >> I prefer DAR for several reasons. First of all, as I mentioned > >> before, DAR is the only backup solution of which I am aware that can > >> restore not only deleted or corrupted files, but which can also > >> restore deletions. This means DAR can restore any or all files one > >> chooses in a batch, but then if requested can go back and delete > >> files which were deleted at a later time but prior to additional > >> DAR backups. > > > > I find it hard to believe that it's a rare feature. > > > > The system I use (`bup`) does support that as well (every backup is > > (more or less) a Git commit, so it doesn't distinguish full-backups from > > incrementals), but it doesn't bother to mention it probably because it's > > very basic. > > Uh-uh. Full, incremenal, and decremental backups are all completely > different than deletion restoral. A GIT commit is somewhat similar, as > is a VM snapshot, but they also are not quite the same. > > All I can say is, "I suggest you read all the features - it is quite a > long list - and try it." I (and I suspect others here) are still pretty confused about what you are trying to explain to us. Here's what I do, and do not, understand: * Incremental and differential backups are backups of the delta between the last full backup and the current system state (either individually [differential] or collectively [incremental]) * I have no idea (nor do Google, DuckDuckGo, or Wikipedia) what a "decremental backup" is. * Borg doesn't fit the "full / differential / incremental" paradigm neatly, but it certainly has some of the advantages of differential / incremental backups (plus others that classic differential / incremental ones do not have, such as deduplication - i.e., if the backup source contains multiple copies of some data, that dataonly needs to be stored once in the backup target). * I don't know exactly what you mean by "deletion restoral", but Borg (and, I assume, many other good backup solutions) offers a flexible variety of methods to restore deleted files, and / or to restore a snapshot of the backup source as it existed at a given point in time: https://docs.borgbase.com/restore/ If you are willing to explain further, that would be appreciated. Thanks! Celejar
