Worried... Can I change to "Smart Backup Retention" after a year of "Keep all backups"?

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The mono from Ubuntu LTS is too old. Have you updated to at least v5?

Release: 2.0.5.1 (beta) 2020-01-18

Important notes:

On Linux, macOS, and other systems that require Mono, this version requires Mono v5 or later.

Install Duplicati on Ubuntu Server 18.04

After update to 2.0.4.27 duplicati crashes on synology

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