Provision of maintenance procedures and tools is at the heart of software engineering, but not in macOS.
backup
Pages refuses to open the document. So how can you gain access to its previous versions?
Why documents can lose their old versions when moving them around, and what you can do to preserve them.
Performs special analysis of Big Sur backups to APFS, and runs native on Intel and Apple Silicon Macs.
Time Machine has been using snapshots since High Sierra. How can it then use them to make backups to APFS volumes in Big Sur?
The most common problems with Time Machine backups, and how to tackle them using free tools.
A detailed walk through the log extract delivered simply by Mints, showing steps in a normal Catalina backup.
APFS adds 6 volume roles, including one which supports Time Machine backups. And per-file encryption is coming.
Important update for all users, which addresses several bugs in setting the maximum size of sparse bundles.
How to set the total size, and band size, for your sparse bundles, with calculation of the critical band size.
The Eclectic Light Company 