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Differential Backups Suddenly Ceased and will Only Create Full Backups

Beginner
Posts: 1
Comments: 2

All was well until my most recent back-up. When I manually -as usual- started it up  it began to create a FULL backup rather than the Differential backups that it had been making - The original and initial Full Backup is still showing on my backup drive along with the past differential backups.  I made sure that the radio button as NOT checked to make a full version every "X" times, tried changing it to Incremental making sure that the above mentioned radio box wasn't check etc. and it will only attempt to produce a Full backup.  Each differential backup was around 50-80 GB.  I have 187.1 GB available but the full backup it's trying to make would be around 187.3 GB.

Why is it out of the blue no longer producing differential or incremental backups??

Thanks

Legend
Posts: 45
Comments: 15139

Welcome to these User Forums.

Please download the MVP Log Viewer tool (link below) and use this to look at the full log messages for your backup task, as this may offer some clues as to why a full backup is being created instead of a differential?

Beginner
Posts: 1
Comments: 2

Below is the log for one of the attempts.  The last entry "terminated by user" occurred when I received the message that the destination drive was running out of room but again that is only because Acronis will no longer create a differential nor incremental backup despite a full back-up bring on the destination drive. Do you see the problem?

 

10/8/2018 4:57:05 PM: 4168 I00640000: Backup reserve copy attributes: format tib; need_reserve_backup_copy false;
10/8/2018 4:57:05 PM: 4168 I00640002: Operation LENO started manually.
10/8/2018 4:57:06 PM: 4168 I00640000: Backup reserve copy attributes: format tib; need_reserve_backup_copy false;
10/8/2018 4:57:06 PM: 4168 I013C0000: Operation: Backup
10/8/2018 4:57:06 PM: 4168 I0064000B: Priority changed to Low.
10/8/2018 4:57:06 PM: 4168 I000B03F0: Create Backup Archive From: To file: X:\LENO.tib Compression: Normal
10/8/2018 4:57:06 PM: 4168 I000101F8: Pending operation 172 started: 'Creating partition image'.
10/8/2018 4:57:43 PM: 488 I00640000: Writing full version to file: LENO_full_b1_s1_v1-2.tib
10/8/2018 4:58:41 PM: 4168 I000101F8: Pending operation 172 started: 'Creating partition image'.
10/8/2018 5:44:07 PM: 4168 W013C0001: Terminated by user.

Start: 10/8/2018 4:57:05 PM
Stop: 10/8/2018 5:44:07 PM
Total Time: 00:47:02

Legend
Posts: 45
Comments: 15139

The only clue in the log data is the entry saying:  Writing full version to file: LENO_full_b1_s1_v1-2.tib

It is creating a file with v1-2 because it has encountered another file with v1 already present for this backup task.

The next point is that the task is creating a b1_s1 backup which suggests that this should be the very first backup file being created for this task, so this further suggests that either information in the Acronis Database for the task has disappeared, or perhaps you have done a restore of either the OS drive or of the C:\Program Data\Acronis folder structure to an earlier point in time?

The only real way forward here would be to delete all the existing LENO backup .tib files and start off with a fresh, new backup version chain, including a new initial full backup file upon which to base any future differential files.

Beginner
Posts: 1
Comments: 2

Hi Steve, thanks for the info. I can't risk deleting those crucial backups  to start over and can't justify buying another new drive when the drive I have still has  a significant amount of space left for the differential backups so let me ask this...

If I tried a delete and reinstall of  Acronis should the reinstall recognize the existing backups -one Full and several Differentials - or does a fresh install not recognize existing Acronis backups?

I would prefer to try this before having to shell out for a new drive just because Acronis has gone haywire out of the blue.

Thanks again for our help!

 

Legend
Posts: 45
Comments: 15139

If I tried a delete and reinstall of  Acronis should the reinstall recognize the existing backups -one Full and several Differentials - or does a fresh install not recognize existing Acronis backups?

You should not need to delete and reinstall ATI for this issue or to find a circumvention for it.

What you can try doing is:

Delete your current backup task in the GUI while leaving the backup .tib files in place.

Use the option to 'Add existing backup' and select the most recent differential .tib file from your backup drive, then reconfigure the backup settings for this new task.

If trying the above, you could take the opportunity to clean up any unwanted differential backups and just keep the most recent, which may free a little more space for you.