What type of records are prioritized for microfilming?

Records with a retention period over 10 years are prioritized for microfilming because these documents are often essential for historical, legal, or administrative purposes. Microfilming provides a means of long-term preservation and security for these records, ensuring that they remain accessible even if the original documents deteriorate over time or if technology changes. By focusing on records with a longer retention period, municipalities can effectively manage their archival responsibilities and provide access to important information for future needs.

The other options are less relevant for prioritization in microfilming. Records with a retention period under 10 years may not require the same level of preservation, as they are likely to be less crucial for long-term reference. Digital records, while important, may have different forms of storage and backup that do not necessitate microfilming as a primary preservation method. Lastly, focusing only on essential governmental records overlooks the value of other documents that may also play a significant role in historical or administrative contexts when retained for longer durations.