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External Hard Drive

Did you copy folders/files or are you using some sort of backup software?
Brian, Time Machine is Apple's proprietary backup software that is included with the purchase of Apple computers. It works as you describe -- the first backup copies everything, so takes a long time -- but after that it only copies files which have have been changed (incremental backup), so usually much faster.
 
Correct!
Just shot more landscapes with the Leica MD262 and when backing up those to Time Machine and Seagate’s external drive was instantaneous…
 
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Not so different than all of your/our internet computer usage being mined & squeezed for data. As 'they' say, if it's free (search engines) you are the commodity.
 
Not so different than all of your/our internet computer usage being mined & squeezed for data. As 'they' say, if it's free (search engines) you are the commodity.
Not to mention umbrage…
 
I use WD passport drives for backup. They are the small ones, physically, that are powered by the single USB cable. They are small enough to fit in a bank safe deposit box, which is where I keep them for safety. I also backup on a larger drive that I keep in my closet.
 

Good to know…
 
Whatever your backup strategy, it is imperative that you regularly confirm that the backups are actually uncorrupted, and that when used in a restoration, restore the files you need restored.
 
Whatever your backup strategy, it is imperative that you regularly confirm that the backups are actually uncorrupted, and that when used in a restoration, restore the files you need restored.

How do I know whether the backups are uncorrupted…
 

Some of my older DVDs aren't accessible anymore. I always use to back up duplicate disks, so I have only lost a few photos.
 
How do I know whether the backups are uncorrupted…

Pick a random sample of files and inspect them. Easy enough to do with photographs.

Restore your backup first to an alternate location. Then from that alternate location, do what koraks suggests.
Easy for photographs and other relatively fixed "data". Harder for photographs plus Lightroom editing records. Even harder sometimes for customized software programs.
 

…!
 
Apple's Time Machine allows for 2 backup drives (ideally in separate locations, but at least in case one crashes).
I work on the computer hard drive, at the end of a session, I copy everything to an 8TB external drive.
The computer and the external are all backed up to 2 TM drives, one 10TB and the other 14TB.
Next time I work, I verify by looking at one of the TM drives or the other that everything I copied to the 8TB external was backed up, then I delete off of the internal computer drive.
Drive space has never been cheaper, and I can't afford to lose all my stuff.
 
George since you can’t afford to lose any thing be sure to unplug at least one of your backups after each session or use an offsite service as well. A couple of years ago lightning struck a tree about 25 feet from our house. It sounded like an explosion and took out most of our electronics including my computer, backup drives, printer, scanner,tvs and more even though all were attached to good surge protectors. Fortunately I had a clone of the computer (unplugged) because the homeowner insurance didn’t cover software. The offsite service had my files and most of my photographs are on film or the sd cards. The 100 year oak was sliced in half but somehow part has survived
 
Be careful. As Apple states: "Your first Time Machine backup includes everything on your Mac. After that, Time Machine finds and saves only new and changed items, so the backups become smaller. Also, as your backup disk fills up, Time Machine deletes older backups to make room for new ones..." So if your back up disk fills up and you have deleted the originals, the older back-up file will be deleted too.
 

Apple's Time Machine is wonderful and has saved myunorganized butt several times in the last few years!
 
As others have said, you are living dangerously if your files are not backed up. Preferably multiple back-ups in case a back-up is corrupt.
I have had hard disks fail.

Mark
 

I have been using Apple's Time Machine for since it first came out and for several generations of machines. When I retire a machine, I move the drive that I dedicated as the Time Machine only drive to the new machine and install it as the second drive before I power up the machine for the first time [per Apple's instructions]. When it powers up, the machine asks if this is an upgrade from a previous machine, points to the second drive and asks if it should restore from that drive and15 to 20 minutes later the machine is ready to go, listing the programs that have been installed and updated [list A], installed but not updated, needing manual updating [list B] and programs which were not loaded because they are now incompatible and should never be installed from available copies [list C]. Then if the Time Machine drive is too small or running out of space, I duplicate that drive to a newer and bigger drive and replace the original Time Machine drive with the newer larger drive. That will be the easiest machine upgrade one can ever have.
 
Reminds me that I have a partially backed up WD drive that had a controller board failure. It is said that I can save the data if I find the exact board. Still haven't found it.
 
I keep all my data files on external hard drives so I can easily migrate to a new machine when necessary. Time Machine will back up those drives, too.
 
I keep all my data files on external hard drives so I can easily migrate to a new machine when necessary. Time Machine will back up those drives, too.

[<<Smile>>]
 

If on your internal harddisk: make a copy with Apple's Time Machine
If on an external (and internal-) harddrive (+/- your question #2): make a carbon copy on an other external disk with Intego Backup Manager Pro (Laci), preferable on a SSD.
A carbon copy can be shared, even cross platform if disk is accordingly formatted...