A shared family Mac has a cleanup problem a single-user Mac doesn't: most of the disk isn't yours to make decisions about. Kids' school projects, a partner's photo exports, someone else's half-finished download — deleting confidently requires knowing whose files you're looking at, and macOS's per-user account structure gives you exactly that information if you know where to look. This is about doing a shared-Mac cleanup properly, which means finding real space without becoming the reason someone loses something they needed.
Understand the account structure first
Each macOS user account gets its own home folder under /Users/, and by default, one account cannot browse another's home folder contents — Documents, Desktop, Downloads, and Library are all private per account unless permissions have been deliberately changed. This is the boundary that matters: if you're not logged in as a particular family member, you generally can't see inside their folders at all, which is both the privacy protection and the practical limit on what you can clean up on their behalf.
Check System Settings → Users & Groups to see every account on the machine. About This Mac → Storage Settings, when logged in as an administrator, can show aggregate space used by each account without necessarily letting you browse into it — useful for identifying who's using the most space before deciding whose cooperation you need.
What administrators can and can't do
An administrator account can see other users' home folder names and top-level structure in Finder, but opening into Documents, Desktop, Downloads, or most of Library inside another user's folder is blocked by default permissions, and macOS will prompt for that user's password to proceed. This is deliberate — being an administrator on a shared Mac gives you system-level control, not automatic access to everyone's personal files.
The practical implication: cleaning up another family member's account requires either their cooperation (best) or their password (acceptable if you manage the account for a child, less appropriate for an adult's account without asking).
The one folder everyone shares
/Users/Shared/ is genuinely shared — every account on the Mac can read and write there by default, which makes it the natural place large family files (a shared video project, holiday photos everyone wants access to) end up, and also the natural place that accumulates unowned clutter nobody feels responsible for cleaning. Check this folder specifically; it's often overlooked because it doesn't belong to any one account's Storage figure the way a personal Downloads folder does.
Per-account cleanup, done respectfully
For each account you have legitimate access to (your own, or one you manage with permission), the same fundamentals apply as on a single-user Mac:
- That account's own
~/Downloads— sorted by size, cleared of installers and old files - That account's own
~/Library/Caches— safe to clear per app, will rebuild - That account's own Trash — doesn't free space until emptied, and each user has a separate Trash
Do this account by account, logged in as each person (or with their direct help), rather than trying to manage it all from one administrator session — you'll hit permission walls, and more importantly, you shouldn't be making judgment calls about which of someone else's files to delete without them present.
The external or shared Photos library question
Many families consolidate photos into a single shared Photos library, often stored on an external drive so every account can point to the same library file via Photos → File → Switch Library. This is efficient — one copy of the family's photos rather than duplicated exports per account — but it means the library's size doesn't show up neatly under any one user's storage figure, and cleaning it (removing duplicates, deleting a burst of near-identical shots) affects everyone who uses it.
Before deleting anything from a shared library, check whether anyone has an in-progress project depending on specific photos being present — a shared resource needs a shared decision, not a unilateral cleanup by whoever happened to notice the disk was full.
Handling kids' accounts
Managed accounts for children are the one case where an adult reasonably has full access and decision-making authority. Even so, it's worth a lighter touch than you might apply to your own files — a school project folder that looks disorganised to you might be exactly how your child expects to find it again. Clear obvious clutter (game caches, downloaded videos already watched) without reorganising or deleting things that look messy but aren't actually taking meaningful space.
Screen Time and storage aren't the same conversation
It's worth being explicit with kids about the difference between a storage cleanup and a Screen Time or app-restriction conversation, since a parent going through a child's account for space reasons can easily be read as the start of the other conversation instead. Framing it clearly — "I'm looking for old game data taking up space, not checking what you've been doing" — keeps the two separate and avoids the cleanup feeling like a pretext for something else, which matters for whether a shared-Mac routine like this stays cooperative over time rather than becoming something to avoid.
When one account is disproportionately large
If Storage Settings shows one account using dramatically more space than the others, it's worth understanding why before treating it as a problem to fix. A teenager's video editing hobby, a partner's professional photo library, or one person's larger collection of downloaded course material for study are all legitimate reasons for an imbalance — the goal of checking per-account usage is visibility, not a mandate that everyone's folder should be the same size.
A shared-Mac cleanup checklist
- Check Storage Settings to see which account is using the most space, without assuming
- Clean
/Users/Shared/first — it's genuinely everyone's responsibility and nobody's exclusively - Ask each family member to spend five minutes on their own Downloads and Trash, rather than doing it for them
- If there's a shared Photos library, raise any cleanup there as a family decision, not a solo one
- Only use administrator access to enter another account's private folders with that person's knowledge, even for a managed child's account where you technically don't need to ask
Where VolumeLens comes in
On a shared Mac, VolumeLens runs within the permissions of whichever account is logged in, which means it naturally respects the same boundaries macOS already enforces — it won't see into another user's private folders any more than Finder would without that user's password. Each family member can run their own scan, see their own honest numbers, and clean up their own account, which keeps a shared-Mac cleanup a series of individual, informed decisions rather than one person guessing on everyone else's behalf.