Duplicate cannot be installed on Synology NAS DSM 7.0
It is not possible to downgrade DSM to version 6.4.
If you manually add the ASK format file in Synology NAS DSM 7.0, an error like the picture occurs
Error : The file format is incorrect. Contact the package developer. message appears
please check thank you in advance
This is a known issue: installation fails on DSM 7 · Issue #4547 · duplicati/duplicati · GitHub
No idea if/when it will be fixed.
One alternative is to use Duplicati inside Docker. If you have never used docker before there is a bit of a learning curve, but in my opinion it’s worth it. (I switched to using the Docker version of duplicati long before I upgraded to DSM 7.) Not all Synology NASes support Docker though.
Is Duplicate not supported in DMS 7.0?
When are you planning to apply?
Correct, it does not currently work on DSM 7. I’m not sure when this will be fixed. I’m just a volunteer on the forum and not a core developer.
If your NAS supports Docker I suggest you look at migrating to that, per my earlier message.