We had borgmatic set up on one of our Synologies, but I can't remember which method we set it up with. Long story short, Synology only provides VERY little space on /. Borg was running fine for months, but its cache was being written to /root/.borg (Or something like that) and so, a time came when / had no space available, so Synology stopped functioning correctly. We had to SSH in to figure out what was going on and to remove the cache. I haven't had a chance to reinvestigate yet, but if the setup instructions are indeed allowing Borg to write to /, they should be adjusted to cause Borg to write its cache to the shared folder location.
We had borgmatic set up on one of our Synologies, but I can't remember which method we set it up with. Long story short, Synology only provides VERY little space on /. Borg was running fine for months, but its cache was being written to /root/.borg (Or something like that) and so, a time came when / had no space available, so Synology stopped functioning correctly. We had to SSH in to figure out what was going on and to remove the cache. I haven't had a chance to reinvestigate yet, but if the setup instructions are indeed allowing Borg to write to /, they should be adjusted to cause Borg to write its cache to the shared folder location.