You can set the standard installation path for Ubisoft games in UPlay.
Click on the three lines in the upper right corner and choose settings
You can find the path under settings.

To find the path for a certain game click in UPlay on
Games -->
Click on the desired game -->
Properties. The path can be found under
Local Files.
To directly access the folder, click on
Open Folder.
[ANNO 1800] Game doesn’t save
Problem
My game doesn’t save anymore. If I start the game the next time, all progress is lost. The game also sometimes crashes when trying to save.
Cause
The most common cause for this that something is blocking the access to the local saves folder which leads to the game not being saved and crashing.
Solution
The executable Anno1800.exe can be found here:
<Installation folder>\Bin\Win64
Further Reading
By crin • Anno 1800, Help • Tags: Save