TerraMaster Official Forum

I did not see anything wrong from the screenshot.

The 265GB is your folder size, not the snapshot size or volume size. if you want to see the snapshot size, go to snapshot> settings, and check" allow snapshot visible".

Here are the properties from both snapshot directories:

Btrfs snapshots don't take up extra space unless there is a change made to the file. So a 100MB file will only ever take up 100MB even if you have a thousand snapshots, providing it hasn't changed anything inside it. The snapshot usually locats under the same folder, so even you have thousand snapshots your folder size should not be much different. Check your folder proporty you will find this is true.
The snapshot file is a special image file, the size showing on your file explorer is not the real size. To check the snapshot file real size, you need to enter linux command btrfs-du.

Hello

First I wanna thank you all for your help.
I'm still a little confused about the snapshots-thing. But at the moment there are bigger problems (like sleepmode, fans).