Two hosts with LXD 4.9 on Ubuntu 20.04 installed via snap. Both use zfs as storage backend.
Daily backup with
lxc copy container remote:container --instance-only --refresh
The storage used differs greatly, some containers take 3x the space (webserver), some seem to miss stuff (isp)
+----------------+------------+------------+
| NAME | DU LOCAL | DU REMOTE |
+----------------+------------+------------+
| acmedns | 905.47MB | 1.74GB |
+----------------+------------+------------+
| dbserver | 793.22MB | 1.37GB |
+----------------+------------+------------+
| isp | 44.91GB | 28.28GB |
+----------------+------------+------------+
| wordpress | 1.32GB | 2.06GB |
+----------------+------------+------------+
| cav | 578.20MB | 619.76MB |
+----------------+------------+------------+
| mail | 84.89GB | 81.71GB |
+----------------+------------+------------+
| webserver | 32.08GB | 95.01GB |
+----------------+------------+------------+
| school | 1.54GB | 2.28GB |
+----------------+------------+------------+
| gitlab | 4.50GB | 5.81GB |
+----------------+------------+------------+
| haproxy | 910.59MB | 1.26GB |
+----------------+------------+------------+
| keycloak | 1.36GB | 1.87GB |
+----------------+------------+------------+
| nextcloudtest | 541.10MB | 847.96MB |
+----------------+------------+------------+
| onetimesecret | 4.37GB | 4.68GB |
+----------------+------------+------------+
| gateway | 3.23GB | 9.29GB |
+----------------+------------+------------+
| video1 | 1.02GB | 1.60GB |
+----------------+------------+------------+
| video2 | 1.12GB | 1.78GB |
+----------------+------------+------------+
I checked with ncdu and found that there a video files in a download directory on the webserver that a 3x of the size on the local server.
Something is really strange in here. Any hints what is going wrong?