start main, working folder: /usr/local/bin/backup_data
start main, time is:        20260914-2048
 == start new loop '10325', 20260914-204837 ==
btrfs subvolume list . | grep -w "snaps/ro_backup" 
 doesn't exist, after test
Create a readonly snapshot of 'subvolume/' in 'snaps/ro_backup'
snapshot /subv/linuxtage/linuxday/arbeitsplatz/snaps/ro_backup/ angelegt
btrfs subvolume list . | grep -w "snaps/ro_backup" 
ID 455 gen 95448 top level 416 path snaps/ro_backup
 exists
Delete subvolume 455 (no-commit): '/subv/linuxtage/linuxday/arbeitsplatz/snaps/ro_backup'
  deleted
btrfs subvolume list . | grep -w "snaps/ro_backup" 
 doesn't exist, after test
Create a readonly snapshot of 'subvolume/' in 'snaps/ro_backup'
snapshot /subv/linuxtage/linuxday/arbeitsplatz/snaps/ro_backup/ angelegt
btrfs subvolume list . | grep -w "snaps/ro_backup" 
ID 456 gen 95451 top level 416 path snaps/ro_backup
 exists
Delete subvolume 456 (no-commit): '/subv/linuxtage/linuxday/arbeitsplatz/snaps/ro_backup'
  deleted
20260914-210000: remove file 'main_lock'
 == start new loop '10326', 20260914-210001 ==
