In some cases, especially if you wish to increase the number of parallel uploads and downloads you might wish to increase the maximum heap memory usage for the application.
You need to find a file in the distribution of the application called underscorebackup.cfg. The location of this file depends on your OS. On Windows it is located in C:\Program Files\Underscore Backup\app\underscorebackup.cfg and there is also a second file used for the GUI application called C:\Program Files\Underscore Backup\app\underscorebackup-gui.cfg. On Linux it is located in /opt/underscorebackup/lib/app/underscorebackup.cfg. On MacOS you need to open the Underscore Backup app bundle (Right click, open) and then find the file lib/app/underscorebackup.cfg.
Once you found this file (Or files on Windows) you need to edit the following line.
[JavaOptions] java-options=-Xmx256m
To increase your usage edit the -Xmx256m to reflect your new value. For instance if you want to use 1GB of memory you could edit it to -Xmx1024m.
On Windows and Linux this edit will be persisted between application upgrades as of version 2.0.0pre2 and later. However on MacOS unfortunately this change will need to be made every time the application is upgraded.
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