As of MODX 2.2.0, you can store the content of any resource or element in a file rather than the DB. You can then use any version control system on the file.
You can also choose Amazon S3, or DropBox for the storage (with more options on the way).
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PLEASE, PLEASE specify the version of MODX you are using . . . PLEASE!
MODX info for everyone:
http://bobsguides.com/modx.html
