Custom backup retention tool

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Check out my post here and let me know if it helps clear things up!

Backup Retention

Keep in mind that Duplicati only stores changes every time it does a backup, so you probably can have many, many versions without it necessarily taking a huge amount of back end storage. Obviously this will vary depending on how much data changes between backups on your system, the type of data, etc. One of my backup sets has 227 versions that span more than 3 years. Source side is 28GB and backend size is 88GB. The “smart” retention is basically a custom retention policy of 1W:1D,4W:1W,12M:…