by George Kopp
In my article from last month, I described what to look for when you purchase a harddrive to backup your Macintosh. This month, I am going to discuss software for doing the backup. There are a number of backup applications available for the Mac and many of these have been around for years.
I will describe the types of backups that could be done and the relative merits of the different backup types. I will also list a few applications I have had luck with. By no means is this software list complete. It is only a sample of applications I would trust to do my backup. So lets get started.
First off, I consider there to be 3 different types of backups.
Comprehensive Backup Included in the Operating System
In MacOS 10.5, Apple introduced what I consider to be a revolution for data safety. Time Machine is a utility that is part of the operating system intended for comprehensive backups. Apple has made Time Machine so simple and has given it so few settings, that novices can easily backup their data and be completely protected. Prior to this ease of use, other third-party backups, while able to run automatically, provided nowhere near this ease of setup.
MacOS 10.5 is designed to recognize a new hard drive when it plugged in and asks if you want to use this for your backup. If you hit OK, you now have just setup Time Machine. If the drive you plugged in is a PC-formatted drive, it may ask to reformat the drive, but even that happens automatically.
Time Machine allows for a full system restore if you lose everything, or an incremental file restore if you just accidentally delete a file. With this, it provides the best of both worlds.
Incremental backup Utilities (usually third party)
This backup type is usually a utility you download, or purchase, that backs up files from your main hard drive to another drive. Sometimes these utilities will claim they allow a full restore but my experience is that these utilizes are best suited for file level backup. This is the act of copying critical files or folders to another drive.
Many utilities in this class (like Retrospect) backup all your files to a single compressed encrypted file. While there is a place for this, most home and small business users don’t need it. In fact, it can turn an already bad experience worse if you cannot get the software installed for the restore or the backup file you created is somehow unreadable. My recommendation is that if you use an incremental backup utility, stick with one that backs up your files to a drive that you can look at to confirm and see that your files are actually there.
Prior to MacOS X 10.5, my backup recommendation in this class was Silverkeeper from Lacie. Silverkeeper is a small application that can run on a set schedule that basically copies files you have preselected from one drive to another. It can be setup to run at a time when you are not busy and it then will update only files that have changed since the last time it has run.
SilverKeeper consists of an application program which will copy, compare, synchronize or restore files, folders, and volumes from a Source to a Destination. It will ease backups from your Startup drive to an external drive. While optimized for hard drives, SilverKeeper is also compatible with network drives, and removable drives, and DVD-RAM discs. Compatible drives may be connected to the SATA/eSATA, IDE/ATA, SCSI, USB, or FireWire busses of Macintosh computers. The only requirement is that the drives must have at a writable volume. SilverKeeper is not directly compatible with tape drives, or CD-R/RW and DVD-R/RW drives.
Unlike other backup and archiving programs, SilverKeeper uses the Macintosh file I/O to perform copy operations, so the backups are always readable files that can be used as-is on another computer without resorting to a special restore application. No special application software is necessary to read the backup files, and it can create and maintain a bootable volume from which it can startup if the internal drive fails.
Apple, through .ME (or .Mac), membership provided a utility called…. Backup that did a similar function. While it was, and still is, a good choice to backup your personal information (addresses, calendars, and settings) to MobileMe, it is not at all a good choice for disk-to-disk to disk backup. It puts the files in a single encrypted file and creates a new file for any new changes making it such that a restore, starts at the beginning and then applies all the changes. Restores using this method could take days if you have been backing up for a quite while.
There are also many other options in this category. Most more premium drives come with a backup utility. But, in general most of them stink. They are thrown in for free and are worth every penny of that. There are also more enterprise utilities (like Retrospect) which are good programs but much too complicated to setup, and even more difficult to execute a restore.
Disk image utilities
This is the third type of backup you might consider. A disk image utility will make an exact block-for-block copy of one hard drive to another drive. It usually is a slow process but you end up with an exact block-for-copy of the drive on another drive. I actually use this for my quarterly off-site backup.
There are three free applications that can perform this backup quite well. Disk Utility (included in the Utility Folder of the Applications Folder) can do this for you in the restore tab of the drive. Basically you just restore one drive to another drive, and end up with an exact copy. Not really very intuitive, but it works and you already have it.
The other two of these can be downloaded. One is Carbon Copy Cloner (CCC) and the other is SuperDuper.
CCC features an interface designed to make the cloning and backup procedure very intuitive. In addition to general backup, CCC can also clone one hard drive to another, copying every single block or file to create an exact bootable replica of your source hard drive. CCC's block-level copy offers the absolute best fidelity in the industry. It can also do incremental backups, if needed.
SuperDuper is the wildly-acclaimed program that makes recovery painless, because it makes creating a fully bootable backup painless. Its incredibly clear, friendly interface is understandable, easy to use, and SuperDuper's built-in scheduler makes it trivial to back up automatically. It's the perfect complement to Time Machine under Leopard, allowing you to store a bootable backup alongside your Time Machine volume—and it runs beautifully on both Intel and Power PC.
When to Backup?
So, this begs the question, “How often do I backup?” My response is, either run your backup, or check your backup at whatever interval you feel you could accept a data loss. In other words, if your data is highly critical, a backup method or schema that backs up every day, or every hour, makes good sense. If you don’t want to deal with that much effort, or if you can afford to loose data for a small while, maybe weekly is often enough for you. It all depends on the value of your data to you.
If you are using a backup utility that requires you to schedule the backup, here is what I would do. Consider your backup a religious experience . . . here is what I mean. Schedule your backup to run while you are at church. On Sunday, before you leave for church, turn your computer on, and the backup can run while you are gone. Making it a routine allows it to get done as part of your regular schedule.
Recommendation
Basically here is my recommendation for this article. If you have Mac OS X 10.5, use Time Machine. If you do not have Mac OS X 10.5, upgrade to this level, and use Time Machine. While other third-party solutions work, and definitely have a place in a belt-and-suspenders approach to bootable backup, Time Machine is reliable, easy and inexpensive. What else can you ask for?
So that’s what I have seen work. Give one of these a try. Keep in mind, the most important thing about backing up is to be sure you schedule a time to do it, and verify it is happening at least once a week. Needing the files from a backup is too late to find out your backups have not run. And, as I mentioned in my earlier article, always pick a backup hard drive that is at least 50% bigger than your internal hard drive.
It is my hope that other people will add to this discussion in the comments and tell us what has worked for them.
Good luck, and keep your data backed up!