Set it. Forget it.
It's backed up.

When BuddyBackup copies a file, it writes to a temporary file first, then swaps it into place in one instant. If your Mac loses power or the drive is unplugged mid-copy, the original backup stays intact. You never end up with a corrupted half-file.

After copying each file, BuddyBackup checks that the copy's size matches the original. If something went wrong, BuddyBackup deletes the bad copy and tries again on the next backup. Nothing slips through silently.

Files on any drive can slowly corrupt over time. A single flipped bit might make a photo unreadable years later. BuddyBackup creates a unique fingerprint of every backed-up file, then periodically re-reads your backups and checks the fingerprints. If a file has silently changed, you'll know before it's too late to recover.

BuddyBackup continuously monitors whether your source and backup drives are still connected. If either disappears mid-backup, BuddyBackup stops immediately and protects what's already backed up. It won't delete files just because a drive was briefly disconnected. When the drive comes back, backups resume automatically.

When you're actively using your Mac — typing, browsing, editing — BuddyBackup automatically slows down so you never notice it running. When your Mac has been idle for a couple of minutes, backups speed up to full speed. No configuration needed.

BuddyBackup pauses heavy backups when your Mac is on battery below 30%, when Low Power Mode is on, or when your Mac is running hot. Backups resume automatically when you plug in or conditions improve.

Files over 64 MB (videos, disk images, project files) are copied in small chunks with progress tracking. You can cancel mid-copy without waiting for a huge file to finish, and BuddyBackup shows you exactly how far along each large file is. Permissions, Finder tags, and creation dates are all preserved.

When you delete a file from your source folder, BuddyBackup never deletes the backup copy. Instead, it moves it to a dated trash folder where it stays until you decide to remove it. A safety guard refuses to archive files if an unusually large number would be removed at once, protecting you against accidental mass deletion.

BuddyBackup checks every destination and rejects unsafe locations — system folders, your home folder root, or folders inside your source. It also warns you if you pick a cloud-synced folder (iCloud Drive, Dropbox), because cloud sync can interfere with backup reliability.