How to install Duplicati on Synology / DSM

Welcome to the forum @ErikZ

Filling by DB is different than filling by backup volumes, just above. Filling by DB is closer to far above.
Synology: warn if server data folder in /root? #3143 is still open and may need a Synology user’s help.

which also (according to far above post), makes it subject to being wiped out by major DSM upgrades.

If there is an always-right place such data should go, and if there is a reliable test for Synology, please
post at the GitHub issue in the hope that a developer will solve the issue and find a Synology to test on.

The reliable test for Synology might not be needed if anything that can install from .spk fits the answer.
Add packages for WD in MyCloudOS 5 #4494 might be a question for a Synology-specific approach…

Although I don’t know Synology install or usage, It might be possible to solve this somewhere in install procedures or scripting, rather than hardcoding it in program logic which is probably far less flexible…

Duplicati.Server.exe or similar is presumably what’s running, and it has some options for DB location:

--server-datafolder
Duplicati needs to store a small database with all settings. Use this option to choose where the settings are stored. This option can also be set with the environment variable DUPLICATI_HOME.

--portable-mode
Activates portable mode where the database is placed below the program executable.

I generally see these if I try to open multiple Duplicati in one browser. I don’t know if you can avoid that in your setup, but if so, please give it a test. I’m not a web developer, but I suspect cookie confusion due to multiple use of what looks like the same site (I use localhost or 127.0.0.1) and path, but at different ports.