If you leave your Mac running overnight, but not sleeping, what does it do? Does it perform maintenance tasks that it would otherwise have to do during the day?
maintenance
As Mac hard disks grew larger, fragmentation of file data, file system metadata and free space slowed the disk down. Here’s how we used to solve that.
In Classic Mac OS, icons were determined by hidden databases. Here’s what we had to do periodically to keep them from breaking.
APFS is almost 4 years old, and set out to solve the problem of accumulation of minor errors which has plagued HFS+. Has it?
With Mac OS 8 and 9 back in 2001, we had to performance routine maintenance to keep the Desktop working. This is how we did it.
The Eclectic Light Company 