CobianSoft

Cobian backup 11 does not delete old backups. The task type is differential, 1 full copies should be stored, 6 difference copies, but when this cycle passes, the old copies are not deleted, there are no errors in the logs

Perhaps the first backup is parked (паркирован)?

I don't understand a little what this means

Если смотреть на Историю для данного задания, то наверное превая копия сблокированна (с красныйм флажком), т.е. она никогда не будет удалена.

Indeed, the lock was there (red flag), is it installed automatically? Accordingly, because of this lock, the old copies were not deleted? Then why do we need a function for storing a certain number of copies?

Can be disabled at Параметры/Программа/Дополнительние настройки/Блокировать первую копию

By removing this parameter, will the backups be stored in the amount that I set?

Yes.