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There are loads of imap backup options from a quick search, such as https://github.com/rcarmo/imapbackup
Another one, lightweight and under active development. No Java / JVM like Solr. :) https://github.com/grosjo/fts-xapian
By the way, the team behind Spider Archiver is iRedMail team who develops the iRedMail (https://www.iredmail.org/ ) open source email server solution since 2007, and still under active development. :)
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.