Unable to create an incremental backup: Unable to load previous backup index required for making incremental backup, full dump will be created instead

Created:

2016-12-12 03:46:27 UTC

Modified:

2017-08-08 13:37:12 UTC

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Unable to create an incremental backup: Unable to load previous backup index required for making incremental backup, full dump will be created instead

Applicable to:

  • Plesk 12.5 for Linux

Symptoms

Unable to create an incremental backup, the following notification is shown in GUI:

Unable to upload dump to FTP, it remains in server repository and you can manually download and upload it to FTP. Upload diagnostic message: Repository error: Destination directory 'ftps://example.com//ftp/' does not exist

Clicking on View log shows the following warning:

WARNING: () Unable to load previous backup index required for making incremental backup, full dump will be created instead

The following error is shown in /usr/local/psa/PMM/sessions/*/migration.result

<execution-result status="warnings" log-location="/usr/local/psa/PMM/sessions/*/migration.result">
<message id="3ff3fc2c-8518-4a71-821a-46a4f0fa370b" severity="warning" code="msgtext">
<description>Unable to load previous backup index required for making incremental backup, full dump will be created instead</description>
</message>
</execution-result>

migration.log contains the following (not sure if this is related):

INFO: tFtpConnection::ReadFile. !m_file.posBuf
INFO: ArchiveStreamReader::ReadFile. Break 3
INFO: ArchiveStreamReader::GetNextTarEntry. Error 2. Unable to read expected size. Readed 0, expected 512 (TAR_BLOCK_SIZE)
INFO: Index extraction impossible, because dump header was not found
INFO: pmm-ras finished. Exit code: 1
...
INFO: Find incremental backups in 'domains/example.com' for prefix 'backup' and base version 1610290210

Connection to FTP server works, but sometimes it gets interrupted:

# ftp ftp.server.com
Trying 10.10.10.10...
ftp: connect to address 10.10.10.10 Connection timed out
ftp: connect: Network is unreachable

Cause

Unstable network connection between Plesk and FTP server.

Resolution

Check FTP logs on the FTP server and fix the connection issue: it should not get interrupted from time to time.

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