I'm currently using the 'unidirectional backup' option of the three options arRysnc presents the user with for file synchronisations.īased on what information I could get from forums, it appears 'unidirectional backup' will consider the source the 'master drive' and copy the differences between the source on to 'destination' drive including differences where files on the source are older than on the target and also where files have been deleted from the source but not on the target. At the end of the operation the destination should be identical to the source including reversions of any file modifications that were newer, updates to any that were older and the deletion of files not present on the source. If my interpretation of the meaning of unidirectional backup is correct then that's exactly what I want. What confuses me is that I don't know then what unidirectional merge would mean, as a matter of fact the inclusion of the word merge seems to me imply a two directional relationship between things so I have trouble understanding how it could be unidirectional and since the most meaningful I guess I have for what it should do, that I can make, would be exactly what unidirectional backup appears to do - I can't figure out what unidirectional merge would be.įor some reason there's no proper documentation with arRsync and therefore no explanation of what any of the 3 options do, which is very odd since there are only 3 so it's basically the only thing the package does. My next best guess would be that unidirectional merge compares modification dates of files from source to target and in the case that the source is the newest version, overwrites it on the destination and in the case that it is older, ignores it (this opposed to a bidirectional synch where in such a case the newest modification from the destination would be copied over to the source). I assume then also that any circumstance where it discovers the presence of files on the destination drive that aren't present on the source it ignores them too (as opposed to bidirectional where it would presumably copy files present on the destination that aren't present on the source). Is this right? It's awfully vague.Īs near as I can tell my guess for how unidirectional backup works is correct and to this end arRsync has been very helpful and also helped avoid me falling in to the many syntax traps that could dog a novice user of Rsync using CLI but the lack of documentation is very perplexing especially given the raison d'être of making a GUI for Rsync would be to simplify its use for people who might find CLI intimidating.
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