Ok, sorry - danke hab mich vertan! ok du hast recht, da ist ne 1.1GB-Datei "synosmartblock"
root@DS916:/lib# cd /var/lib
root@DS916:/var/lib# du -xhd1
12K ./letsencrypt
120K ./data_update
24K ./drive_attribute
32K ./temperature
2.0M ./disk-compatibility
16K ./net-snmp
4.0K ./ldap
1.1G ./synosmartblock
3.7M ./portforward
8.0K ./btrfs
8.0K ./securityscan
20K ./postfix
4.0K ./raid_bitmap
4.0K ./ntp
32K ./synologan
40K ./sss
8.0K ./dovecot
236K ./smartmontools
8.0K ./ssd-bundle
8.0K ./datascrubbing
16K ./dpkg
16K ./nfs
8.0K ./openvswitch
1.8M ./samba
20K ./diskaction
4.0K ./drbd
8.0K ./systemd
32K ./space
16K ./memory-compatibility
1.1G .
root@DS916:/lib# cd /var/lib
root@DS916:/var/lib# du -xhd1
12K ./letsencrypt
120K ./data_update
24K ./drive_attribute
32K ./temperature
2.0M ./disk-compatibility
16K ./net-snmp
4.0K ./ldap
1.1G ./synosmartblock
3.7M ./portforward
8.0K ./btrfs
8.0K ./securityscan
20K ./postfix
4.0K ./raid_bitmap
4.0K ./ntp
32K ./synologan
40K ./sss
8.0K ./dovecot
236K ./smartmontools
8.0K ./ssd-bundle
8.0K ./datascrubbing
16K ./dpkg
16K ./nfs
8.0K ./openvswitch
1.8M ./samba
20K ./diskaction
4.0K ./drbd
8.0K ./systemd
32K ./space
16K ./memory-compatibility
1.1G .