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Life & fun · October 23, 2023

Time Machine Utilities

I wrote some shell scripts to automate "fixing" old Time Machine backups, particularly Time Machine backups from previous computers. I've personally experienced a lot of friction with this, and found out that some of the metadata stored in the Backups.backupdb and individual snapshot directories prevent successful use with Time Machine on other computers in some cases. Time Machine itself does not always handle this gracefully. These utilities should help users wrangle older backups to make them work with Time Machine on their current Mac.

Time Machine Utilities launched on October 23, 2023 with 14 votes, #1,404 of 4,393 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 3 years on.

In plain words

Time Machine Utilities is a collection of shell scripts that automate the process of fixing old Time Machine backups, especially those from previous computers. It addresses compatibility issues where metadata in backup files prevents Time Machine from working properly on different Macs. The scripts modify backup structure and metadata to make older backups functional with Time Machine on current computers, solving a problem that Time Machine itself does not handle gracefully.

written from the facts on this page · September 2026

From the sources

Time Machine utilities for Mac to import a backup history, mark individual snapshot directories as valid for the current computer, and deduplicate files in parallel directories (e.g., between snapshot directories). - torstenvl/tmutils

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