Problems with differential backup using an encrypted base file

I have been using Comodo Backup for about two years and am currently on v4.1.4.0. Until recently, I would run a full backup of Drives C+D+G each week. File sizes: C 65G, D 83G and F 76G. The backup was encrypted. Recently, the backup has failed at around 95% complete, with an error message about memory (“Not enough memory”?)

I now backup the three drives as three seperate backups, still encrypted. However, this is inconvenient as I cannot run this unattended overnight and I have been unable to run the 3 backups in batch mode.

My preference would be to use differential and incremental backups in batch mode but I have had problems running CBU with an encrypted source file. The program does not allow input of the pw for an encrypted base file. Also the program does not accept a previous backup using either automatic base or selected base. See these 2 MP4 videos - 20 sec and 28 sec. (Comodo - Differential - Automatic base.mp4)
Comodo Backup -- Differential - Selected base (Comodo Backup – Differential - Selected base.mp4)

I have deleted Comodo Backup via Add/Remove Programs and have reinstalled but probelems remain.

Three questions:

  1. Is there a way to solve the problems shown in the videos?

  2. Is there a way to run three backups via a batch file using scripts as an argument for CBU in command line mode? I have been able to run one but unable to find a command or sequence of commands that will completely close CBU.

The test files that I have used are:

“C:\Program Files\COMODO\COMODO BackUp\CBU.exe” /schedule_mode manual s/script “test_c.txt” /silentRun /guiRunMode 5

“C:\Program Files\COMODO\COMODO BackUp\CBU.exe” /schedule_mode manual s/script “test_d.txt” /silentRun /guiRunMode 5

/backup_operation /type filesandfolders /source "C:\pdf995" /schedule_mode manual /compressionlevel high /destinationtype destinationtypediskfile /destinationpath “I:\test_C_pdf995_full_files|DATE1|.cbu” /backup_type full /diskusage high /processorusage high /log_file “C:\Test_C.log” /log_method “append” \guiRunMode 5

  1. TestScript1 was running ok but now comes up with the CBU Message “Insert encryption password for C:\Documents and Settings\OJB\MyDocuments\test_c.txt” As there is no encryption pw, I have tried “Enter”, space and the computer pw but none work. How do I get around this?

Any assistance would be appreciated.

To determine cause of the issue we need the debug information.

When using “automatic base” differential cbu, the base is determined using the following rules, in this order:

  • if backup is scheduled/saved as profile and if a full backup base was specified and it still exists it will be used as base
  • for all backups (saved or not as schedule/profile), the destination file (the name need to match exactly) will be checked if it can be used as base. To be valid, it has to be the same source type and it has to contain a full backup. If it is valid it will be used as base, otherwise the backup will run as full (as in your case). If backup is saved as profile/schedule, the full backup will be base for next runs.

Yes, save the backup as profile or schedule and it will run as a full backup first time, then as differential.

Yes, you can export the differential backup job to script with automatic base. The backup will run as full first time, then as differential. You must not use macros in this case. Differentials will be appended to full backup. If you want the differential backup files to have different names, you should save it as profile/schedule.

This message is seen when the script syntax is wrong. The "" should be “/” here: "\guiRunMode 5 "


Many thanks, Emanuel. Appreciated.