![]() So to reach the 700TB limit, you would have to write 40GB worth of data every day for 17,500 days, or about 50 years… …Although some people worry that SSDs have a limited number of reads and writes…Considering that Solid State drives usually come with a three to five year warranty, it means that manufacturers assume you will be writing 20GB-40GB of data per day. We know HDD are reliable offline stores, but SSD probably doesn’t have the data to say yet – existing data shows over 1 year retention for old / near EOL devices should be no issue if stored at less than 30C. In terms of hard drive vs SSD, SSD is more reliable But it will get there, given enough time for it to happen. I am referring here to periods of several years, not of days, weeks or months, before this becomes a noticeable and even a serious issue. The only thing of a general nature, applicable to all magnetic storage devices to keep in mind is that, very slowly but inevitably, the magnetic domains that are flipped in the equivalent to an “on” or an “off” state and, stringed together form the binary numbers and instructions behind your documents, pictures, various other data and software, those domains will flip to the other, useless state from the point of view of preserving the data, quite “spontaneously” (OK, driven by cosmic ray hits and other things that contribute to the eternal rise in entropy), so the information stored in those devices slowly degrades and vanishes to be replaced by “noise”, “static”, “snow” or whatever, no matter which brand is that of the drive in question. If all you do with the external drive is backups, and you are not terribly diligent and make one or two backups a day or something like that, but do a backup maybe once or twice a month, an external storage drive probably will last longer than if it were the mass storage drive, HD or SSD, inside your computer that is used all the time. SSD drives are probably more reliable than flash USB drives (also known as memory sticks, thumb drives and by several other names) Maybe the latter are better these days, but once upon a time, several years ago, I experimentally used a thumb drive as an external disk, and it died an early death after just a few months (but slowly enough for me to have time to get most of the data inside back out and into the PC’s HD). Wonders shall never end, but I have no idea of what is going on. News Flash: I have not tried to back up again, but I just looked into TM, and there, surprise, surprise, are all the files I remember creating from last time I backed up, most particularly some files I created today. So here I am now, with no TM back up and waiting for some illuminating advice. I cancelled again the back up and trashed the proto-backup file once more - as repeatedly and consistently recommended in a number of places when searching the Web for some kind of solution. ![]() But then it got, once more, firmly stuck, this time further than previously at 49 GB. I found that clicking on the window showing the progress of the back up would sort of encourage TM to do a few more GB. ![]() Then I started the backup again, and it took a sweet time for TM to “prepare to backup.” Then it started and stopped. The TM hard disk has a capacity of 4 TB and is considerably more than 3/4 empty at present. By then I had unplugged and plugged in back the cord of the Time Machine Hard Disk, just in case that was the reason for the whole problem - it was not. I shut down the machine, waited a bit, restarted it again. So, in the end, I yanked it to much protesting from the Mac. Then, oh, then the Mac would not eject Time Machine. Eventually I stopped the non-performing back up after more than 2 1/2 hours and trashed the “in Progress” file. Looking again half an hour later, still 39 GB, half an hour later, same thing. That last back up was over a month ago.Īt my first of two attempts today, I noticed that it had stalled at around 39 GB. Usually the amount to be backed up, as declared in the TimeMachine/Preferences is considerably less than that, and I don’t remember adding any massive files since the previous backup, but maybe two or three GB in bits and pieces since then. Today however, is taking very long to get to close to the middle of the 111 GB that is trying to back up - and then it stalls. ![]() Usually when I back up my SSD to Time Machine, a 4 TB spinning Hard Disk (less than three years old and little used, as I back up once every few weeks – I know, I know), it takes about 20 – 30 minutes. ![]()
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