Previously, I always used Arq. I want to try out Duplicacy now to see if I maybe prefer it over Arq.
I have setup Duplicacy, using the Web GUI, and I like the overall setup. There are a bunch of questions I don’t find any answers to though, I wish there would be a bit more documentation.
The Quick Start Guide mentions “Starting from version 1.1.0, Duplicacy Web Edition can be installed as a Windows service”. Should I do that, or should I not do that? What is the difference, what is the advantage, what is the disadvantage of installing it as a service?
The default seems to be to not use VSS on Windows. I know Arq by default uses VSS. Why does Duplicacy not use VSS by default? Is there a reason why I should keep VSS disabled with Duplicacy? Is it not stable to use with Duplicacy?
I have configured a backup to Google Cloud with Duplicacy. I selected my whole C drive, which is an NVMe SSD. I run the backup with the -threads 20 option as part of an hourly schedule. That leads to Duplicacy uploading with a constant 25 MBit’s. I have tried different values for the -threads option, but it never goes above 25 MBit’s. What is limiting it? Duplicacy only uses very little CPU, RAM and Disk activity.
I have then tried backing up a different disk simultaneously, that also uploads with 25 MBit’s, so then I get a total of 50 MBit’s, so the cloud storage and my internet can definitely do 50 MBit’s, but why can the individual backup task not?
- Then I tried something where I expected it would probably not even allow me to configure it that way, but it did: I added a second schedule, with all the same settings as the first schedule, that again also works on backing up my C backup. So I have two different schedules that back up the same “Source” to the same “Destination”. And indeed, now when I run those two schedules simultaneously, I can nicely backup my C drive with a total of 50 MBit’s.
Is that how I am supposed to do that? Why do I need two schedules for that, just to be able to reach my full upload speed? It seems kinda weird to do it that way. I am surprised that it works to backup the same disk simultaneously two times. Can that lead to any issues, or is this how you’re supposed to do it to get the maximum speed? Can it happen that those two tasks end up basically uploading the exact same files twice, as they’re working on them simultaneously?
- Does Duplicacy automatically exclude things like the pagefile from the upload, or do I have to manually configure that?