Free and low-cost third-party compression apps are available for the Mac, but Mac OS X and macOS both come with a built-in compression system that can zip and unzip files. This integrated system is relatively basic, which is why many third-party apps are also available. A quick look at the Mac App Store revealed more than 50 apps for zipping and unzipping files.

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Before you download a third-party app, learn how to compress and decompress files and folders using the Archive Utility built into the Mac. It's a basic tool, but it gets the job done.

OS X and macOS Compression

The Archive Utility includes options that you can modify, but don't bother to look for it in the Applications folder; it's not there. Apple hides the utility because it's a core service of the operating system. Apple and app developers use core services to enhance an application's capabilities. For example, Mac Mail uses the Archive Utility to compress and decompress attachments; Safari uses it to decompress files you download.

The Archive Utility has settings you can modify, but most users never need them. Right now it is a better idea to get used to the utility as configured in its default state. You can always try new settings later.

The Archive Utility may be hidden away, but that doesn't mean you can't access its services. Apple makes zipping and unzipping files and folders extremely easy by selecting them in the Finder and using the Archive Utility.

Zipping a Single File or Folder

1. Open a Finder window and navigate to the file or folder you want to compress.

2. Control-click (or right-click if you have a mouse with that capability) the item and select Compress from the pop-up menu. The name of the item you select appears after the word Compress, so the actual menu item reads Compress 'item name.'

The Archive Utility zips the selected file. The original file or folder is left intact. The compressed version is in the same folder as the original file (or on the desktop, if that's where the file or folder is located), It has the same name as the original file with a .zip extension.

Zipping Multiple Files and Folders

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Compressing multiple files and folders works about the same as compressing a single item. The only differences are in the names of the items that appear in the pop-up menu and the name of the zip file that is created.

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1. Open the folder that contains the files or folders you want to compress.

2. Select the items you want to include in the zip file. Shift-click to select a range of files or Command-click to select nonadjacent items.

3. After you select all the files and folders you want to include in the zip file, right-click or Control-click on any one of the items and select Compress from the pop-up menu. This time, the word Compress is followed by the number of items you selected, such as Compress 5 Items.

When the compression is finished, the items are stored in a file called Archive.zip, which is located in the same folder as the original items.

If you already have an item in that folder named Archive.zip, a number is appended to the new archive's name. For example, you could have Archive.zip, Archive 2.zip, Archive 3.zip, and so on.

One curious aspect of the numbering system is that if you delete the Archive.zip files at a later date, and then compress multiple files in the same folder, the new Archive.zip file has the next number in the sequence appended to it; it doesn't start over. For example, if you compress three groups of multiple items in a folder, you end up with files called Archive.zip, Archive 2.zip, and Archive 3.zip. If you delete the zip files from the folder, and then zip another group of items, the new file is named Archive 4.zip, even though Archive.zip, Archive 2.zip, and Archive 3.zip no longer exist in that folder.

Unzipping a File

Unzipping a file or folder couldn't be easier. Double-click the zip file, and the file or folder decompressed in the same folder as the compressed file.

If the item you are decompressing contains a single file, the new decompressed item has the same name as the original file.

If a file with the same name is already present in the current folder, the decompressed file has a number appended to its name.

Folder for Multiple Unzipped Items

When a zip file contains multiple items, the unzipped files are stored in a folder that has the same name as the zip file. For example, if you unzip a file called Archive.zip, the files are placed in a folder called Archive. This folder is located in the same folder as the Archive.zip file. If the folder already contains a folder called Archive, a number is appended to the new folder, such as Archive 2.

Apps for Compressing or Decompressing Mac Files

If you want more file compression features than Apple offers in its Archive Utility, third-party apps are available. They include:

If you're a Tumblr user, you probably noticed the massive outage it endured this weekend, and you're probably having one of those 'what if I'd lost everything' moments. Here's how to back up your Tumblr to save yourself from such distress.

We don't talk about Tumblr a ton around here, but the sheer mass of this week's outage probably left a lot of people thinking—not only about their Tumblr, but other blogs and social networks in the process. Sometimes things go down, and while often it's only for a short while and your data isn't lost, it's important to be prepared for the worst.

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To that end, there's the Mac app Tumblr Backup, or the older, web-based Backup Jammy. Both keep all of your Tumblr data saved in easily viewable HTML format on your hard drive.

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Tumblr Backup (an app officially from Tumblr) is a simple and self-explanatory app: just log in, tell it where you want to save your backup, and let it go to work. Note that it doesn't back up privabe tumbelogs, submissions, notes, feed-imported posts, or audio files from reblogged posts.

Tumblr Backup is a free download for Mac OS X. You can also backup tumblelogs with the web-based Backup Jammy, and it's equally easy to use.

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If you're not a Tumblr user but you've still been scared into a backup frenzy after this weekend's events, you'll definitely want to check out previously mentionedBackupify for backing up your other services.

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