Zip file generated with backup tool will have non-ascii chars tranformed into trashy names. Sample: we have style named
Flood risk 2050 – damage SSP1
(mind the – character), which will be written to zip with following file name (unzip -l geoserver_catalog.zip):
10360 2017-03-24 07:20 styles/Flood risk 2050 тАУ damage SSP1.sld
Final path name depends on charset used for filesystem.