It's not impossible, it's just terribly complicates very simple things. No image back ups. No incremental image backups. No incremental backups of the DB. No backup od DB dumps. You need to reorganize everything, and in this case it complicates things a lot. For small and middle-size companies dealing with a lot of customer data (like hospitality industry), this is a major headache. And we do keep our records very well.