Mac Care

A Mac usually tells you something is wrong long before it tells you why: a disk suddenly almost full, a machine that drags for days after an update, an app that opens at every login, a battery that no longer lasts the afternoon. Bulk-deleting caches or running a cleaner app changes many things at once, so you never learn what helped.

These guides are for people who rely on a Mac for work or study. They cover storage, slowdowns, startup items, backups, and battery health, starting from tools already on your Mac, and follow the rule we build our own macOS software around: look before you delete, change one thing at a time, prefer changes you can undo. Menu names follow macOS 26 Tahoe and macOS 27 Golden Gate.

Find out what is using space before deleting anything

System Settings > General > Storage (macOS 13 and later) sorts your disk into categories. The confusing one, System Data, is Apple's catch-all for files with no more specific category: a label, not a folder to empty. Time Machine's local snapshots count as available space and are deleted when macOS needs room. The full-disk guide shows what is actually large and what is safe to remove.

After an update, let the Mac settle, then measure

Spotlight re-indexes after an update, and Apple says that can take hours or even days, finishing sooner when the Mac is idle and plugged in; the Spotlight window (Command–Space) shows its progress. Low free disk space and memory-hungry apps head Apple's own list of slowdown causes. The slow-after-update guide is a calm, step-by-step diagnosis with Activity Monitor and the system logs.

Know what launches at login and in the background

System Settings > General > Login Items & Extensions (Login Items before macOS 15) holds two lists. Open at Login covers what opens when you sign in. App Background Activity (Allow in the Background before macOS 26) covers apps allowed to work while closed, including launch agents and daemons: helpers that launchd, the macOS service manager, runs for your account or the whole system. The startup items guide explains how to decide what to switch off.

Trust a backup only after you have restored from it

By default, Time Machine keeps hourly backups for a day, daily for a month, and weekly after that, deleting the oldest when its disk fills. A drive beside your Mac, though, can be lost in the same theft or fire. The 3-2-1 rule covers that: three copies including the original, on two kinds of media, one offsite. The backup strategy guide adds the offsite copy and a practice restore.

Judge battery health by capacity, not today's percentage

The menu bar percentage is today's charge; health is how much the battery can still hold compared with when it was new. Apple counts a charge cycle as a full battery's worth of use, so using half on two separate days makes one cycle. Supported laptops show Battery Health in System Settings > Battery as Normal or Service Recommended.

How to use this hub

Before deleting or disabling anything, check in System Settings > General > Time Machine that your latest backup is recent. Then read in this order:

1. What is filling your disk, and what is safe to delete.
2. The slow-Mac diagnosis, to see what is using your processor and memory.
3. What launches at login, to trim what starts every time you sign in.

To check disk space, login items, and battery health in one place, Tend, our local-first macOS app with no account or telemetry, works one issue at a time and sends cleanups to the Trash, so they can be undone.